feat(integrations): declare which surface each client is, and its version (#7326)

cli/node/src/backend/platform.ts

@@ -31,7 +31,8 @@ export class PlatformBackend implements Backend {
 		this.headers = {
 			Authorization: `Token ${config.apiKey}`,
 			"Content-Type": "application/json",
-			"X-Mem0-Source": "cli",
+			"X-Mem0-Source": "CLI",
+			"X-Mem0-Client": `mem0-cli-node/${CLI_VERSION}`,
 			"X-Mem0-Client-Language": "node",
 			"X-Mem0-Client-Version": CLI_VERSION,
 		};

cli/python/src/mem0_cli/backend/platform.py

@@ -27,7 +27,8 @@ class PlatformBackend(Backend):
             headers={
                 "Authorization": f"Token {config.api_key}",
                 "Content-Type": "application/json",
-                "X-Mem0-Source": "cli",
+                "X-Mem0-Source": "CLI",
+                "X-Mem0-Client": f"mem0-cli-python/{__version__}",
                 "X-Mem0-Client-Language": "python",
                 "X-Mem0-Client-Version": __version__,
             },

integrations/AGENTS.md

@@ -49,6 +49,48 @@ Run the type check after every TypeScript change: `pnpm run typecheck` or `tsc -
 - **`zapier-mem0/`** is a Zapier Platform CLI app: add, search, get, delete. It deploys to Zapier, not npm, so it is **not** in the release router. Deploy it with `gh workflow run zapier-mem0-cd.yml --ref main` (needs the `ZAPIER_DEPLOY_KEY` secret).
 - **`mem0-strands/`** is a native Strands `MemoryStore` (Python, published to PyPI as `mem0-strands`). It plugs into the Strands `MemoryManager` for automatic recall and server-side extraction, over the hosted Mem0 platform or self-hosted Mem0 OSS. The package lives under `mem0-strands/python/`.
 
+## Surface attribution
+
+Every integration tells the Mem0 platform which surface it is. Three headers,
+and the rules on them are what keep one layer from erasing another:
+
+| Header | Carries | Rule |
+|--------|---------|------|
+| `X-Mem0-Source` | one canonical source value | **set-once** — write only if absent |
+| `X-Application` | the host app it runs inside | **set-once** — write only if absent |
+| `X-Mem0-Client` | `name/version`, outermost first | **append-only** — add yourself, never replace |
+
+Set-once means check-then-set, never assignment. An integration that wraps the
+SDK is the outermost layer and sets the source; the SDK underneath defers to it.
+Assignment is exactly how every agent plugin came to be indistinguishable from
+every other one at the platform.
+
+How to declare it from an integration, in order of preference:
+
+1. Send the headers yourself, if you make the HTTP call directly.
+2. Pass `source` in the call options, if you go through an SDK.
+3. Set `MEM0_SOURCE` / `MEM0_APPLICATION` / `MEM0_CLIENT_STACK` in the
+   environment before constructing the client. The SDKs read these and defer to
+   anything already present.
+
+Append-only applies where a stack can actually form: an SDK handed a client that
+already carries `X-Mem0-Client` appends itself rather than replacing. An SDK
+constructed with no outer context simply reports itself, which is correct — it
+is the outermost layer in that process.
+
+The backend recognizes a fixed list of source values and buckets everything else
+into `OTHERS`. A new value has to land in the platform's `EventSource` enum, so
+do not invent one without that change going in too.
+
+`X-Application` is allowlisted the same way, and this one has a rule of its own:
+**omit the header when you do not know the host.** A value outside the allowlist
+is discarded server-side, so guessing produces an event that claims an
+attribution we do not actually have. The portable bundle is the case that
+matters. It runs in whatever editor a user drops it into, so its build leaves
+`PLATFORM_APPLICATION` empty and `memory_core` sends no header at all, while the
+native bundles each name the host they were generated for. If you add a build
+target, decide which of those two it is.
+
 ## Adding an integration
 
 1. For a native coding-agent host, add `integrations/<name>-plugin/` with `plugin-build.json`, its manifest, and a thin adapter, then generate its shared runtime. Portable clients use the single `mem0-agent-plugin/` package. Independent TypeScript integrations stay self-contained and import shared lifecycle behavior from `agent-plugin-core/typescript/`.
@@ -59,3 +101,4 @@ Run the type check after every TypeScript change: `pnpm run typecheck` or `tsc -
 5. If it is a Claude Code or editor marketplace plugin, register the generated native bundle path in the applicable marketplace files. Preserve the existing public plugin name.
 6. Document it under `docs/integrations/` and add the page to `docs/docs.json` and `docs/llms.txt`.
 7. Add rows to the table above and to the CI/CD tables in [`../.github/AGENTS.md`](../.github/AGENTS.md).
+8. Send the three headers in [Surface attribution](#surface-attribution), and land the matching `EventSource` value on the platform in the same week. Until it exists, your traffic reports as `OTHERS`.

integrations/agent-plugin-core/build/build.py

@@ -81,15 +81,23 @@ def replace_output(staged: Path, output: Path) -> Path:
     return output
 
 
-def _render_harness_id(host: str) -> str:
+def _render_harness_id(host: str, *, portable: bool = False) -> str:
     """Emit core/_harness_id.py for one host.
 
     Carries both vocabularies from a single definition: the PostHog `source` tag
     and the platform's X-Mem0-Source / X-Application pair. Keeping them together
     is what stops the two from drifting into separate vocabularies for the same
     thing.
+
+    The portable bundle runs in whatever editor a user drops it into, so it does
+    not know its host and must not guess one. HARNESS_ID stays "coding-agent",
+    which is true and useful for grouping in PostHog, but PLATFORM_APPLICATION is
+    left empty: X-Application names a real host app, is checked against an
+    allowlist server-side, and a value that is always discarded is worse than no
+    value -- it reads like an attribution we have and do not.
     """
     tag = host.upper().replace("-", "_") + "_PLUGIN"
+    application = "" if portable else host
     return (
         '"""Generated by integrations/agent-plugin-core/build/build.py. Do not edit."""\n'
         "\n"
@@ -98,8 +106,10 @@ def _render_harness_id(host: str) -> str:
         "\n"
         "# Platform-side vocabulary (mem0_event.source + X-Application). The whole\n"
         "# plugin family is one source; which editor it runs in is the application.\n"
+        "# An empty application means the host is unknown, and memory_core omits\n"
+        "# the header entirely rather than sending a placeholder.\n"
         'PLATFORM_SOURCE = "MEM0_PLUGIN"\n'
-        f'PLATFORM_APPLICATION = "{host}"\n'
+        f'PLATFORM_APPLICATION = "{application}"\n'
     )
 
 
@@ -122,7 +132,7 @@ def _bundle_python(
     # to call telemetry.init(). mcp_server.py and the detached telemetry.py sender
     # never did, which is how MCP searches reported harness=generic and every
     # batch they drained was labelled MEM0_PLUGIN regardless of the real host.
-    (core / "_harness_id.py").write_text(_render_harness_id(host), encoding="utf-8")
+    (core / "_harness_id.py").write_text(_render_harness_id(host, portable=portable), encoding="utf-8")
 
     values = {
         "PLUGIN_ROOT": plugin_root,

integrations/agent-plugin-core/python/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/agent-plugin-core/tests/test_build.py

@@ -70,6 +70,38 @@ def test_portable_bundle_is_conformant_and_self_contained(tmp_path: Path) -> Non
     assert not any(path.is_symlink() for path in root.rglob("*"))
 
 
+def _harness_identity(root: Path) -> dict[str, str]:
+    """Read the generated core/_harness_id.py without importing it."""
+    values: dict[str, str] = {}
+    for line in (root / "core" / "_harness_id.py").read_text(encoding="utf-8").splitlines():
+        if "=" in line and not line.lstrip().startswith("#"):
+            name, _, raw = line.partition("=")
+            values[name.strip()] = raw.strip().strip('"')
+    return values
+
+
+def test_the_portable_bundle_declares_no_host_application(tmp_path: Path) -> None:
+    """It runs in whatever editor a user drops it into, so it cannot know the host.
+
+    X-Application is allowlisted server-side. A guessed value is silently dropped
+    there, which is the worst outcome: the wire says we know the host and the
+    stored event says we do not.
+    """
+    identity = _harness_identity(build("mem0-agent-plugin", "portable", tmp_path / "portable"))
+
+    assert identity["PLATFORM_APPLICATION"] == ""
+    # The PostHog-side label is still useful for grouping and stays populated.
+    assert identity["HARNESS_ID"] == "coding-agent"
+    assert identity["PLATFORM_SOURCE"] == "MEM0_PLUGIN"
+
+
+@pytest.mark.parametrize("host", ["claude-code", "cursor", "codex", "kimi", "antigravity"])
+def test_a_native_bundle_names_the_host_it_was_built_for(host: str, tmp_path: Path) -> None:
+    identity = _harness_identity(build(host, "native", tmp_path / host))
+
+    assert identity["PLATFORM_APPLICATION"] == host
+
+
 @pytest.mark.parametrize("host", ["claude-code", "cursor", "codex", "kimi", "antigravity"])
 def test_native_bundle_is_self_contained(host: str, tmp_path: Path) -> None:
     root = build(host, "native", tmp_path / host)

integrations/agent-plugin-core/tests/test_uninitialised_identity.py

@@ -179,6 +179,33 @@ def test_source_tag_defaults_agree_between_the_two_modules():
     assert left == right == "KIMI_PLUGIN"
 
 
+def test_the_plugin_declares_its_surface_in_the_body_and_the_headers():
+    """Body and headers both, because only the body works on every backend."""
+    core = _core_dir("claude-code-plugin")
+    if not core.exists():
+        pytest.skip("claude-code-plugin is not built in this tree")
+
+    with tempfile.TemporaryDirectory() as tmp:
+        out = _run(
+            core,
+            Path(tmp),
+            "import json, memory_core\n"
+            "h = memory_core.platform_headers('k')\n"
+            "print(json.dumps({'source': h.get('X-Mem0-Source'),"
+            " 'app': h.get('X-Application'),"
+            " 'client': h.get('X-Mem0-Client'),"
+            " 'auth': h.get('Authorization'),"
+            " 'ctype': h.get('Content-Type')}))",
+        )
+    headers = json.loads(out)
+    assert headers["source"] == "MEM0_PLUGIN"
+    assert headers["app"] == "claude-code"
+    assert headers["client"].startswith("mem0-plugin/")
+    # The transport headers the three call sites relied on must survive.
+    assert headers["auth"] == "Token k"
+    assert headers["ctype"] == "application/json"
+
+
 def _session_start(core: Path, data_dir: Path) -> list[str]:
     """Drive the real hook_runner session-start path and return lifecycle events."""
     recorded = "\n".join(

integrations/antigravity-plugin/core/_harness_id.py

@@ -5,5 +5,7 @@ SOURCE_TAG = "ANTIGRAVITY_PLUGIN"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.
+# An empty application means the host is unknown, and memory_core omits
+# the header entirely rather than sending a placeholder.
 PLATFORM_SOURCE = "MEM0_PLUGIN"
 PLATFORM_APPLICATION = "antigravity"

integrations/antigravity-plugin/core/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/claude-code-plugin/core/_harness_id.py

@@ -5,5 +5,7 @@ SOURCE_TAG = "CLAUDE_CODE_PLUGIN"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.
+# An empty application means the host is unknown, and memory_core omits
+# the header entirely rather than sending a placeholder.
 PLATFORM_SOURCE = "MEM0_PLUGIN"
 PLATFORM_APPLICATION = "claude-code"

integrations/claude-code-plugin/core/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/codex-plugin/core/_harness_id.py

@@ -5,5 +5,7 @@ SOURCE_TAG = "CODEX_PLUGIN"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.
+# An empty application means the host is unknown, and memory_core omits
+# the header entirely rather than sending a placeholder.
 PLATFORM_SOURCE = "MEM0_PLUGIN"
 PLATFORM_APPLICATION = "codex"

integrations/codex-plugin/core/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/cursor-plugin/core/_harness_id.py

@@ -5,5 +5,7 @@ SOURCE_TAG = "CURSOR_PLUGIN"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.
+# An empty application means the host is unknown, and memory_core omits
+# the header entirely rather than sending a placeholder.
 PLATFORM_SOURCE = "MEM0_PLUGIN"
 PLATFORM_APPLICATION = "cursor"

integrations/cursor-plugin/core/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/deepseek-plugin/src/index.ts

@@ -26,8 +26,9 @@ export const name = "mem0";
 export const inject = ["tools", "systemPrompt"];
 
 // Tags writes so Mem0's backend attributes them to this integration in
-// telemetry. The backend's KNOWN_EVENT_SOURCES allowlist recognizes this value;
+// telemetry. Values outside the backend's KNOWN_EVENT_SOURCES allowlist bucket
-// anything outside it buckets into "OTHERS".
+// into "OTHERS"; this one is added by mem0ai/platform#3602 and reads as OTHERS
+// until that ships.
 const SOURCE = "DEEPSEEK_HARNESS";
 
 const DEFAULT_SEARCH_LIMIT = 10;

integrations/kimi-plugin/core/_harness_id.py

@@ -5,5 +5,7 @@ SOURCE_TAG = "KIMI_PLUGIN"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.
+# An empty application means the host is unknown, and memory_core omits
+# the header entirely rather than sending a placeholder.
 PLATFORM_SOURCE = "MEM0_PLUGIN"
 PLATFORM_APPLICATION = "kimi"

integrations/kimi-plugin/core/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/mem0-agent-plugin/core/_harness_id.py

@@ -5,5 +5,7 @@ SOURCE_TAG = "CODING_AGENT_PLUGIN"
 
 # Platform-side vocabulary (mem0_event.source + X-Application). The whole
 # plugin family is one source; which editor it runs in is the application.
+# An empty application means the host is unknown, and memory_core omits
+# the header entirely rather than sending a placeholder.
 PLATFORM_SOURCE = "MEM0_PLUGIN"
-PLATFORM_APPLICATION = "coding-agent"
+PLATFORM_APPLICATION = ""

integrations/mem0-agent-plugin/core/memory_core.py

@@ -1800,6 +1800,34 @@ def extraction_message_batches(
     return batches
 
 
+# Platform surface attribution. Read from the generated per-host module so a new
+# entrypoint is correct without remembering to configure anything.
+try:  # pragma: no cover - absent only in the un-built shared source tree
+    from _harness_id import PLATFORM_APPLICATION as _PLATFORM_APPLICATION
+    from _harness_id import PLATFORM_SOURCE as _PLATFORM_SOURCE
+except ImportError:
+    _PLATFORM_SOURCE = "MEM0_PLUGIN"
+    _PLATFORM_APPLICATION = ""
+
+
+def platform_headers(key: str) -> dict[str, str]:
+    """Auth plus the three surface-identity headers.
+
+    X-Mem0-Source and X-Application are set-once by contract: this is the
+    outermost layer, so it sets them, and nothing below may overwrite them.
+    X-Mem0-Client is append-only — anything downstream adds itself to the tail.
+    """
+    headers = {
+        "Authorization": f"Token {key}",
+        "Content-Type": "application/json",
+        "X-Mem0-Source": _PLATFORM_SOURCE,
+        "X-Mem0-Client": f"mem0-plugin/{PLUGIN_VERSION}",
+    }
+    if _PLATFORM_APPLICATION:
+        headers["X-Application"] = _PLATFORM_APPLICATION
+    return headers
+
+
 def _request_json(
     url: str, key: str, payload: dict[str, Any], timeout: float
 ) -> tuple[dict[str, Any] | list[Any], int, int]:
@@ -1807,7 +1835,7 @@ def _request_json(
     request = urllib.request.Request(
         url,
         data=raw,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="POST",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1834,7 +1862,7 @@ def _get_json(
 ) -> tuple[dict[str, Any] | list[Any], int]:
     request = urllib.request.Request(
         url,
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="GET",
     )
     with urllib.request.urlopen(request, timeout=timeout) as response:
@@ -1980,6 +2008,13 @@ def flush_session(
         "user_id": write_user,
         "app_id": repo.app_id,
         "run_id": session_id,
+        # Top level, not metadata: the backend reads `source` from the body or
+        # the query string, never from metadata, which is where this used to
+        # sit. The X-Mem0-Source header is also read, but only from the
+        # platform release that ships alongside this change, so the body value
+        # is what makes attribution work on both. The harness tag stays in
+        # metadata as hook provenance.
+        "source": _PLATFORM_SOURCE,
         "metadata": {**metadata, "author": write_user, "dirs": directory_chain(repo)},
         "agent_custom_instructions": PROJECT_MEMORY_INSTRUCTIONS,
         "custom_instructions": PERSONAL_MEMORY_INSTRUCTIONS,
@@ -2523,7 +2558,7 @@ def _collect_memory_ids(
 def _delete_memory(api_url: str, key: str, memory_id: str) -> bool:
     request = urllib.request.Request(
         f"{api_url}/v1/memories/{urllib.parse.quote(memory_id)}/",
-        headers={"Authorization": f"Token {key}", "Content-Type": "application/json"},
+        headers=platform_headers(key),
         method="DELETE",
     )
     try:

integrations/pi-agent-plugin/src/attribution.test.ts

@@ -0,0 +1,80 @@
+import { describe, expect, it } from "vitest";
+import { applySurfaceHeaders, PLATFORM_APPLICATION, PLATFORM_SOURCE } from "./attribution.ts";
+
+function client(headers: Record<string, string> = {}) {
+  return { headers: { Authorization: "Token k", ...headers } } as never;
+}
+
+describe("applySurfaceHeaders", () => {
+  it("stamps the shared client so every path is attributed, not just commands", () => {
+    const mem0 = client();
+    applySurfaceHeaders(mem0);
+    const headers = (mem0 as unknown as { headers: Record<string, string> }).headers;
+
+    expect(headers["X-Mem0-Source"]).toBe(PLATFORM_SOURCE);
+    expect(headers["X-Application"]).toBe(PLATFORM_APPLICATION);
+    expect(headers["X-Mem0-Client"]).toMatch(/^mem0-pi-agent\//);
+    expect(headers.Authorization).toBe("Token k");
+  });
+
+  it("defers to a surface an outer wrapper already declared", () => {
+    const mem0 = client({ "X-Mem0-Source": "OPENCLAW", "X-Application": "vscode" });
+    applySurfaceHeaders(mem0);
+    const headers = (mem0 as unknown as { headers: Record<string, string> }).headers;
+
+    expect(headers["X-Mem0-Source"]).toBe("OPENCLAW");
+    expect(headers["X-Application"]).toBe("vscode");
+  });
+
+  it("appends to the client stack rather than replacing it", () => {
+    const mem0 = client({ "X-Mem0-Client": "openclaw/2.1.0" });
+    applySurfaceHeaders(mem0);
+    const headers = (mem0 as unknown as { headers: Record<string, string> }).headers;
+
+    expect(headers["X-Mem0-Client"]).toMatch(/^openclaw\/2\.1\.0, mem0-pi-agent\//);
+  });
+
+  it("treats a blank header as absent", () => {
+    const mem0 = client({ "X-Mem0-Source": "   " });
+    applySurfaceHeaders(mem0);
+    const headers = (mem0 as unknown as { headers: Record<string, string> }).headers;
+
+    expect(headers["X-Mem0-Source"]).toBe(PLATFORM_SOURCE);
+  });
+
+  it("bounds the stack so a long chain cannot grow the header without limit", () => {
+    const mem0 = client({ "X-Mem0-Client": "a/1, b/1, c/1, d/1, e/1" });
+    applySurfaceHeaders(mem0);
+    const headers = (mem0 as unknown as { headers: Record<string, string> }).headers;
+
+    expect(headers["X-Mem0-Client"].split(",").length).toBeLessThanOrEqual(4);
+    expect(headers["X-Mem0-Client"].length).toBeLessThanOrEqual(200);
+  });
+});
+
+describe("client stack bounding", () => {
+  it("keeps our own entry when the caller already filled the stack", () => {
+    // The defect: pushing then trimming to four dropped exactly the entry this
+    // function exists to add, so we vanished from our own stack.
+    const mem0 = client({ "X-Mem0-Client": "a/1, b/2, c/3, d/4" });
+    applySurfaceHeaders(mem0);
+    const stack = (mem0 as unknown as { headers: Record<string, string> }).headers["X-Mem0-Client"];
+
+    expect(stack).toMatch(/mem0-pi-agent\//);
+    expect(stack.split(",").length).toBeLessThanOrEqual(4);
+  });
+
+  it("drops whole entries at the character cap, never a fragment", () => {
+    const long = `${"n".repeat(90)}/1.0, ${"m".repeat(90)}/1.0, ${"o".repeat(90)}/1.0`;
+    const mem0 = client({ "X-Mem0-Client": long });
+    applySurfaceHeaders(mem0);
+    const stack = (mem0 as unknown as { headers: Record<string, string> }).headers["X-Mem0-Client"];
+
+    expect(stack.length).toBeLessThanOrEqual(200);
+    expect(stack.endsWith("/0.0.0") || /mem0-pi-agent\/[\w.\-]+$/.test(stack)).toBe(true);
+    // Every surviving entry is whole: name/version, no severed tail.
+    for (const entry of stack.split(",")) {
+      expect(entry.trim()).toMatch(/^[^/]+\/[^/]+$/);
+    }
+  });
+});

integrations/pi-agent-plugin/src/attribution.ts

@@ -0,0 +1,65 @@
+import type MemoryClient from "mem0ai";
+import * as fs from "node:fs";
+
+/** Surface identity for this plugin, as the platform's EventSource knows it. */
+export const PLATFORM_SOURCE = "PI_AGENT";
+
+/** Host app the plugin runs inside. Allowlisted server-side. */
+export const PLATFORM_APPLICATION = "pi";
+
+const PLUGIN_VERSION = (() => {
+  try {
+    return JSON.parse(
+      fs.readFileSync(new URL("../package.json", import.meta.url), "utf-8"),
+    ).version as string;
+  } catch {
+    return "unknown";
+  }
+})();
+
+const MAX_STACK_ENTRIES = 4;
+const MAX_STACK_CHARS = 200;
+
+/**
+ * Append our own entry and bound the result, dropping WHOLE entries.
+ *
+ * Neither cap cuts characters: slicing the joined string severs an identifier
+ * and leaves a fragment the platform parses as a real client name. And the
+ * reserved slot is ours, since it is the only entry this layer can vouch for.
+ */
+function boundedStack(callerEntries: string[], own: string): string {
+  const kept: string[] = [];
+  let budget = MAX_STACK_CHARS - own.length;
+  for (const entry of callerEntries.slice(0, MAX_STACK_ENTRIES - 1)) {
+    const cost = entry.length + ", ".length;
+    if (cost > budget) break;
+    budget -= cost;
+    kept.push(entry);
+  }
+  return [...kept, own].join(", ");
+}
+
+/**
+ * Stamp surface identity onto the shared client, once, at construction.
+ *
+ * Tagging individual call sites was not enough: automatic recall, capture, the
+ * memory tools and deletion all go through this same client, so everything
+ * except the explicit slash commands reached the platform as generic SDK
+ * traffic. Every request method in the SDK sends `this.headers`, so setting
+ * them here covers all of them.
+ *
+ * X-Mem0-Source and X-Application are set-once, so a wrapper that already named
+ * a surface keeps it. X-Mem0-Client is append-only, so the platform sees the
+ * whole chain rather than only the last speaker.
+ */
+export function applySurfaceHeaders(client: MemoryClient): void {
+  const headers = client.headers as Record<string, string>;
+  if (!headers["X-Mem0-Source"]?.trim()) headers["X-Mem0-Source"] = PLATFORM_SOURCE;
+  if (!headers["X-Application"]?.trim()) headers["X-Application"] = PLATFORM_APPLICATION;
+
+  const existing = (headers["X-Mem0-Client"] ?? "")
+    .split(",")
+    .map((part) => part.trim())
+    .filter(Boolean);
+  headers["X-Mem0-Client"] = boundedStack(existing, `mem0-pi-agent/${PLUGIN_VERSION}`);
+}

integrations/pi-agent-plugin/src/commands.ts

@@ -1,3 +1,4 @@
+import type { SearchMemoryOptions } from "mem0ai";
 import type { ExtensionAPI } from "@earendil-works/pi-coding-agent";
 import type MemoryClient from "mem0ai";
 import type { Mem0Config, ScopeContext, Scope } from "./types.ts";
@@ -5,6 +6,12 @@ import { DEFAULT_CUSTOM_CATEGORIES } from "./types.ts";
 import { resolveSearchFilters, resolveAddParams } from "./memory/scoping.ts";
 import { formatMemoryList, formatMemoryCompact, groupByCategory } from "./memory/formatting.ts";
 import { captureCommandEvent } from "./telemetry.ts";
+import { PLATFORM_SOURCE } from "./attribution.ts";
+
+// Wire identity is set once on the shared client in entry.ts, which covers
+// every path including recall, capture, tools and deletion. It stays in the
+// body of the two calls below as well: body `source` is what the backend reads
+// when the header is absent.
 
 const SEARCH_TOP_K = 10;
 
@@ -29,7 +36,12 @@ export function registerCommands(
       threshold: config.searchThreshold,
       topK: SEARCH_TOP_K,
       rerank: true,
-    });
+      source: PLATFORM_SOURCE,
+      // Widened by exactly this one property. `source` reaches the wire via the
+      // SDK's camelToSnakeKeys spread, but it is absent from SearchMemoryOptions
+      // in the published mem0ai types. A blanket `as never` would also disable
+      // checking of filters, threshold, topK and rerank above.
+    } as SearchMemoryOptions & { source: string });
     return result.results ?? [];
   };
 
@@ -45,7 +57,7 @@ export function registerCommands(
       const addParams = resolveAddParams(config.defaultScope, getScopeCtx());
       const result = await mem0.add(
         [{ role: "user", content: text }],
-        { ...addParams, customCategories: DEFAULT_CUSTOM_CATEGORIES, infer: false },
+        { ...addParams, customCategories: DEFAULT_CUSTOM_CATEGORIES, infer: false, source: PLATFORM_SOURCE },
       );
       captureCommandEvent("mem0-remember", {}, telemetryCtx);
 

integrations/pi-agent-plugin/src/entry.ts

@@ -10,6 +10,7 @@ import { captureEvent } from "./telemetry.ts";
 import * as os from "node:os";
 import type { ScopeContext } from "./types.ts";
 import { createMemoryLifecycle } from "../../agent-plugin-core/typescript/src/lifecycle.ts";
+import { applySurfaceHeaders } from "./attribution.ts";
 
 export { buildRecallContext } from "../../agent-plugin-core/typescript/src/lifecycle.ts";
 
@@ -29,6 +30,11 @@ export default function mem0Extension(pi: ExtensionAPI): void {
   }
 
   const mem0 = new MemoryClient({ apiKey: config.apiKey });
+  // Every path below shares this client: automatic recall, capture, the memory
+  // tools and deletion as well as the slash commands. Attribution belongs here
+  // rather than on individual calls, or everything except the commands reports
+  // as generic SDK traffic.
+  applySurfaceHeaders(mem0);
 
   const scopeCtx: ScopeContext = {
     userId: resolveUserId(config.userId),

integrations/vercel-ai-sdk/src/mem0-utils.ts

@@ -1,3 +1,10 @@
+declare const __MEM0_PROVIDER_VERSION__: string | undefined;
+
+// Replaced at build time by tsup `define`. The fallback only applies when the
+// source is run unbundled, such as in tests.
+const PROVIDER_VERSION =
+  typeof __MEM0_PROVIDER_VERSION__ !== "undefined" ? __MEM0_PROVIDER_VERSION__ : "dev";
+
 import { LanguageModelV3Prompt } from '@ai-sdk/provider';
 import { Mem0ConfigSettings } from './mem0-types';
 import { loadApiKey } from '@ai-sdk/provider-utils';
@@ -277,7 +284,11 @@ const searchInternalMemories = async (query: string, config?: Mem0ConfigSettings
             method: 'POST',
             headers: {
                 Authorization: `Token ${apiKey}`,
-                'Content-Type': 'application/json'
+                'Content-Type': 'application/json',
+                // Surface attribution. Set-once by contract: this wrapper is the
+                // outermost layer on these raw fetch calls.
+                'X-Mem0-Source': 'VERCEL_AI_SDK',
+                'X-Mem0-Client': `mem0-vercel-ai-provider/${PROVIDER_VERSION}`
             },
             body: JSON.stringify(body),
         };
@@ -331,7 +342,11 @@ const updateMemories = async (messages: Array<Message>, config?: Mem0ConfigSetti
             method: 'POST',
             headers: {
                 Authorization: `Token ${apiKey}`,
-                'Content-Type': 'application/json'
+                'Content-Type': 'application/json',
+                // Surface attribution. Set-once by contract: this wrapper is the
+                // outermost layer on these raw fetch calls.
+                'X-Mem0-Source': 'VERCEL_AI_SDK',
+                'X-Mem0-Client': `mem0-vercel-ai-provider/${PROVIDER_VERSION}`
             },
             body: JSON.stringify(body),
         };

integrations/vercel-ai-sdk/tsconfig.json

@@ -12,6 +12,7 @@
       "noUnusedLocals": false,
       "noUnusedParameters": false,
       "preserveWatchOutput": true,
+      "resolveJsonModule": true,
       "skipLibCheck": true,
       "strict": true,
       "types": ["@types/node", "jest"],

integrations/vercel-ai-sdk/tsup.config.ts

@@ -1,4 +1,5 @@
 import { defineConfig } from 'tsup'
+import pkg from './package.json'
 
 export default defineConfig([
   {
@@ -6,5 +7,11 @@ export default defineConfig([
     entry: ['src/index.ts'],
     format: ['cjs', 'esm'],
     sourcemap: true,
+    // Injected rather than written in the source. A hardcoded literal matches
+    // package.json on the day it is written and misreports the client version
+    // from the next release bump onwards. Same mechanism as mem0-ts.
+    define: {
+      __MEM0_PROVIDER_VERSION__: JSON.stringify(pkg.version),
+    },
   },
 ])

mem0-ts/src/client/mem0.ts

@@ -95,6 +95,66 @@ interface ClientIdentity {
 const IDENTITY_CACHE_MAX_DEFAULT = 50;
 const identityByCredentials = new Map<string, Promise<ClientIdentity>>();
 
+declare const __MEM0_SDK_VERSION__: string | undefined;
+
+// Injected by tsup (see mem0-ts/tsup.config.ts `define`), the same mechanism
+// telemetry.ts already uses. A hardcoded literal goes stale at the next release
+// bump and then misreports the client version forever.
+const SDK_VERSION =
+  typeof __MEM0_SDK_VERSION__ !== "undefined" ? __MEM0_SDK_VERSION__ : "dev";
+
+const MAX_STACK_ENTRIES = 4;
+const MAX_STACK_CHARS = 200;
+
+/**
+ * Append our own entry and bound the result, dropping WHOLE entries.
+ *
+ * Neither cap cuts characters: slicing the joined string severs an identifier
+ * and leaves a fragment the platform parses as a real client name. And the
+ * reserved slot is ours. Pushing first and then trimming to four dropped exactly
+ * the entry this exists to add whenever a caller already sent four, so we
+ * vanished from our own stack while every caller claim survived.
+ */
+function boundedStack(callerEntries: string[], own: string): string {
+  const kept: string[] = [];
+  let budget = MAX_STACK_CHARS - own.length;
+  for (const entry of callerEntries.slice(0, MAX_STACK_ENTRIES - 1)) {
+    const cost = entry.length + ", ".length;
+    if (cost > budget) break;
+    budget -= cost;
+    kept.push(entry);
+  }
+  return [...kept, own].join(", ");
+}
+
+/**
+ * Surface-identity headers.
+ *
+ * X-Mem0-Source and X-Application are SET-ONCE by contract: whichever layer is
+ * outermost sets them and nothing below overwrites, so a plugin wrapping this
+ * SDK keeps its own identity. X-Mem0-Client is APPEND-ONLY - every layer adds
+ * itself, so the platform sees the whole stack and not just the last speaker.
+ */
+function surfaceHeaders(): Record<string, string> {
+  const env: Record<string, string | undefined> =
+    typeof process !== "undefined" && process.env ? process.env : {};
+  const existing = (env.MEM0_CLIENT_STACK ?? "").trim();
+  const entries = existing
+    ? existing
+        .split(",")
+        .map((part) => part.trim())
+        .filter(Boolean)
+    : [];
+  const headers: Record<string, string> = {
+    "X-Mem0-Client": boundedStack(entries, `mem0-js/${SDK_VERSION}`),
+  };
+  const source = (env.MEM0_SOURCE ?? "").trim();
+  if (source) headers["X-Mem0-Source"] = source;
+  const application = (env.MEM0_APPLICATION ?? "").trim();
+  if (application) headers["X-Application"] = application;
+  return headers;
+}
+
 export default class MemoryClient {
   apiKey: string;
   host: string;
@@ -129,6 +189,7 @@ export default class MemoryClient {
     this.headers = {
       Authorization: `Token ${this.apiKey}`,
       "Content-Type": "application/json",
+      ...surfaceHeaders(),
     };
 
     this.client = axios.create({

mem0-ts/src/client/mem0.types.ts

@@ -30,6 +30,9 @@ export interface SearchMemoryOptions {
   showExpired?: boolean;
   referenceDate?: string | number;
   keywordSearch?: boolean;
+  /** Surface that produced the call, e.g. "OPENCLAW". Must be a value the
+   *  backend's EventSource enum knows, or it buckets into OTHERS. */
+  source?: string;
 }
 
 export interface GetAllMemoryOptions {

mem0/client/main.py

@@ -79,6 +79,95 @@ def _maybe_alias_anon_to_email(user_email):
         logger.debug("Failed to alias anon telemetry to %r: %s", user_email, e)
 
 
+def _sdk_version() -> str:
+    """Resolved here rather than imported from the package root, which would cycle."""
+    try:
+        import importlib.metadata
+
+        return importlib.metadata.version("mem0ai")
+    except Exception:
+        return "unknown"
+
+
+def _apply_client_headers(client: Any, api_key: str, user_id: str) -> None:
+    """Merge our headers into a caller-supplied client without erasing theirs.
+
+    A wrapper may hand us a client already carrying its own X-Mem0-Source or a
+    partial X-Mem0-Client stack. Blanket update() replaced both, which is the
+    opposite of the set-once / append-only contract: the outermost layer is the
+    one whose identity should survive.
+    """
+    existing = client.headers
+    mine = _client_headers(api_key, user_id)
+
+    outer_stack = existing.get("X-Mem0-Client")
+    if outer_stack:
+        entries = [part.strip() for part in str(outer_stack).split(",") if part.strip()]
+        mine["X-Mem0-Client"] = _bounded_stack(entries, f"mem0-python/{_sdk_version()}")
+
+    for name, value in mine.items():
+        if name in ("X-Mem0-Source", "X-Application") and existing.get(name):
+            continue
+        existing[name] = value
+
+
+MAX_STACK_ENTRIES = 4
+MAX_STACK_CHARS = 200
+
+
+def _bounded_stack(caller_entries, own: str) -> str:
+    """Append our own entry and bound the result, dropping WHOLE entries.
+
+    Two rules, and the second is the one that was wrong. Neither cap cuts
+    characters: a blunt slice severs an identifier and leaves a fragment that
+    parses as a real client name. And the reserved slot is OURS. Appending first
+    and then trimming to four dropped exactly the entry this function exists to
+    add, every time a caller already sent four, so the SDK vanished from its own
+    stack while the caller's claims all survived.
+    """
+    kept = []
+    budget = MAX_STACK_CHARS - len(own)
+    for entry in list(caller_entries)[: MAX_STACK_ENTRIES - 1]:
+        cost = len(entry) + len(", ")
+        if cost > budget:
+            break
+        budget -= cost
+        kept.append(entry)
+    return ", ".join(kept + [own])
+
+
+def _client_headers(api_key: str, user_id: str) -> Dict[str, str]:
+    """Auth plus surface-identity headers.
+
+    X-Mem0-Source and X-Application are SET-ONCE by contract: whichever layer is
+    outermost sets them, and nothing below overwrites. A plugin or harness that
+    wraps this SDK therefore keeps its own identity — it declares via MEM0_SOURCE
+    / MEM0_APPLICATION and the SDK defers.
+
+    X-Mem0-Client is APPEND-ONLY: every layer adds itself, so the platform sees
+    the whole stack rather than only whoever spoke last.
+    """
+    headers = {
+        "Authorization": f"Token {api_key}",
+        "Mem0-User-ID": user_id,
+        "X-Mem0-Client": _client_stack(),
+    }
+    source = os.getenv("MEM0_SOURCE", "").strip()
+    if source:
+        headers["X-Mem0-Source"] = source
+    application = os.getenv("MEM0_APPLICATION", "").strip()
+    if application:
+        headers["X-Application"] = application
+    return headers
+
+
+def _client_stack() -> str:
+    """This SDK appended to any stack an outer layer already declared."""
+    existing = os.getenv("MEM0_CLIENT_STACK", "").strip()
+    entries = [part.strip() for part in existing.split(",") if part.strip()] if existing else []
+    return _bounded_stack(entries, f"mem0-python/{_sdk_version()}")
+
+
 class MemoryClient:
     """Client for interacting with the Mem0 API.
 
@@ -129,19 +218,11 @@ class MemoryClient:
             self.client = client
             # Ensure the client has the correct base_url and headers
             self.client.base_url = httpx.URL(self.host)
-            self.client.headers.update(
+            _apply_client_headers(self.client, self.api_key, self.user_id)
-                {
-                    "Authorization": f"Token {self.api_key}",
-                    "Mem0-User-ID": self.user_id,
-                }
-            )
         else:
             self.client = httpx.Client(
                 base_url=self.host,
-                headers={
+                headers=_client_headers(self.api_key, self.user_id),
-                    "Authorization": f"Token {self.api_key}",
-                    "Mem0-User-ID": self.user_id,
-                },
                 timeout=300,
             )
         self.user_email = self._validate_api_key()
@@ -1018,19 +1099,11 @@ class AsyncMemoryClient:
             self.async_client = client
             # Ensure the client has the correct base_url and headers
             self.async_client.base_url = httpx.URL(self.host)
-            self.async_client.headers.update(
+            _apply_client_headers(self.async_client, self.api_key, self.user_id)
-                {
-                    "Authorization": f"Token {self.api_key}",
-                    "Mem0-User-ID": self.user_id,
-                }
-            )
         else:
             self.async_client = httpx.AsyncClient(
                 base_url=self.host,
-                headers={
+                headers=_client_headers(self.api_key, self.user_id),
-                    "Authorization": f"Token {self.api_key}",
-                    "Mem0-User-ID": self.user_id,
-                },
                 timeout=300,
             )
 
@@ -1053,10 +1126,7 @@ class AsyncMemoryClient:
             params = self._prepare_params()
             response = requests.get(
                 f"{self.host}/v1/ping/",
-                headers={
+                headers=_client_headers(self.api_key, self.user_id),
-                    "Authorization": f"Token {self.api_key}",
-                    "Mem0-User-ID": self.user_id,
-                },
                 params=params,
             )
             response.raise_for_status()

tests/test_client_surface_headers.py

@@ -0,0 +1,63 @@
+"""Surface-identity headers, and that a client can be constructed at all.
+
+The construction test exists because it was not there: a signature change to
+_bounded_stack missed the _client_stack call site, every MemoryClient(...) raised
+TypeError, and the whole suite stayed green because nothing built one.
+"""
+
+import os
+from unittest.mock import patch
+
+from mem0.client.main import _bounded_stack, _client_headers, _client_stack
+
+
+def test_a_client_can_be_constructed():
+    from mem0 import MemoryClient
+
+    # _validate_api_key normally populates org/project from the API response;
+    # stubbing it leaves them None, which a later accessor rejects. Set them the
+    # way a real validation would. This test is about construction reaching the
+    # header stage at all.
+    def _stub(self):
+        self.org_id, self.project_id = "org", "proj"
+
+    with patch.object(MemoryClient, "_validate_api_key", _stub):
+        client = MemoryClient(api_key="m0-test")
+
+    assert client.client.headers["X-Mem0-Client"].startswith("mem0-python/")
+
+
+# AsyncMemoryClient is deliberately not constructed here: its validation path
+# makes a real request to /v1/ping/, and a unit test that needs the network is
+# worse than none. It shares _client_headers with the sync client, which is the
+# code the construction test above actually guards.
+def test_headers_carry_this_sdk():
+    headers = _client_headers("m0-test", "u1")
+    assert headers["X-Mem0-Client"].startswith("mem0-python/")
+
+
+def test_our_entry_survives_a_caller_that_already_filled_the_stack():
+    # Appending first and trimming to four dropped exactly the entry the
+    # function exists to add.
+    stack = _bounded_stack(["a/1", "b/2", "c/3", "d/4"], "mem0-python/9.9.9")
+
+    assert "mem0-python/9.9.9" in stack
+    assert len(stack.split(",")) <= 4
+
+
+def test_the_character_cap_drops_whole_entries_not_characters():
+    long_entries = [f"{'n' * 90}/1.0", f"{'m' * 90}/1.0", "c/3"]
+    stack = _bounded_stack(long_entries, "mem0-python/9.9.9")
+
+    assert len(stack) <= 200
+    assert stack.endswith("mem0-python/9.9.9")
+    for entry in stack.split(","):
+        assert entry.strip().count("/") == 1, f"severed entry: {entry!r}"
+
+
+def test_an_outer_stack_is_appended_to_not_replaced():
+    with patch.dict(os.environ, {"MEM0_CLIENT_STACK": "openclaw/2.1.0"}):
+        stack = _client_stack()
+
+    assert stack.startswith("openclaw/2.1.0")
+    assert "mem0-python/" in stack