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feat(mem0-plugin): add OpenCode & Antigravity plugins, CC parity, docs cleanup (#5268)

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Kartik
2026-05-27 23:17:37 +05:30
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mem0-plugin/CHANGELOG.md
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All notable changes to the Mem0 plugin will be documented in this file.
## 0.1.0 — OpenCode & Antigravity
### Added
- **OpenCode plugin** (`@mem0ai/opencode-plugin` on npm): Pure TypeScript plugin using the `mem0ai` TS SDK — no Python, no shell scripts. Hooks into all 6 OpenCode events (`chat.message`, `tool.execute.before`, `tool.execute.after`, `experimental.chat.system.transform`, `experimental.session.compacting`, `shell.env`). Features: session start memory loading, per-prompt semantic search, error pattern detection with memory lookup, resume/remember intent detection, auto-capture every 3rd message, periodic save nudges, full metadata defaults injection (confidence, source, type, session_id, files, branch), identity injection for search/get/delete filters, type-filtered error pre-fetch (anti_pattern + bug_fix), pre-compaction memory capture, MEMORY.md write blocking, and secret redaction.
- **16 OpenCode-native skills** bundled in `opencode-skills/`: `context-loader`, `dream`, `export`, `forget`, `health`, `import`, `list-projects`, `mem0` (SDK reference), `memory-reviewer`, `onboard`, `peek`, `pin`, `remember`, `stats`, `switch-project`, `tour`. All skills are pure MCP-tool-based — no Python scripts, no shell scripts, no Claude Code dependencies.
- **Auto-install skills and commands (`installSkills()`):** On plugin load, copies all 16 skills to `.opencode/skills/` and creates command wrapper files in `.opencode/commands/` so they appear in the OpenCode `/` palette. No manual setup needed.
- **`extractUserText()` handler:** Robust text extraction from OpenCode response shapes — handles `parts[]` array, `content[]` array, `message.content`, and plain string responses.
- **Identity resolution:** `getUserId()` uses `os.userInfo().username` (matching Claude Code's `${USER}` convention) with `MEM0_USER_ID` env override. `getProjectId()` uses git remote with `MEM0_APP_ID` env override.
- **Context injection via `experimental.chat.system.transform`:** All memory context (session start memories, per-prompt search results, error-related memories, compaction context) injected as system context.
- **CLI installer (`cli.ts`):** `bunx @mem0ai/opencode-plugin install` auto-configures plugin and MCP server in `~/.config/opencode/opencode.json`.
- **Antigravity plugin** (`.antigravity/`): Restructured to follow the same shared-infrastructure pattern as Claude Code, Cursor, and Codex. Self-contained plugin directory with `plugin.json`, `mcp_config.json`, `hooks/hooks.json` (own file), `scripts/` (symlink → `../scripts/`), and `skills/` (symlink → `../skills/`). Installable via `agy plugin install .antigravity` or `npx degit mem0ai/mem0/mem0-plugin/.antigravity ~/.gemini/config/plugins/mem0`. Uses `contextFileName: "AGENTS.md"` per Antigravity convention.
- **Codex hooks parity:** Added missing `PreToolUse` Write/Edit/MultiEdit block and `PreCompact` hook to Codex hooks config, bringing it to full parity with Claude Code.
### Changed
- **Antigravity plugin directory:** Renamed `.antigravity-plugin/` → `.antigravity/` to match the naming convention of `.claude-plugin/`, `.cursor-plugin/`, `.codex-plugin/`. Plugin is now self-contained so `agy plugin install` and `npx degit` both work.
- **Antigravity hooks:** Hooks now live directly in `.antigravity/hooks/hooks.json` as a standalone file — no indirection.
- **Antigravity install command:** Updated from `npx degit mem0ai/mem0/mem0-plugin` to `npx degit mem0ai/mem0/mem0-plugin/.antigravity`. Added `agy plugin install` as alternative for local clones.
### Removed
- **Stale root-level files:** Deleted `mem0-plugin/hooks.json`, `mem0-plugin/mcp_config.json`, `mem0-plugin/plugin.json` — leftover artifacts from before plugin restructuring into per-editor subdirectories. Nothing referenced them; install commands point to `.antigravity/`.
## 0.2.7
### Fixed
- **First-install auth failure (closes #4876):** Removed `authorizationUrl` from `.mcp.json`. When both a static `Authorization` header and `authorizationUrl` were present, Claude Code preferred the OAuth flow, which failed on reconnect — leaving new users stuck with only `authenticate`/`complete_authentication` stub tools. Authentication now uses the `MEM0_API_KEY` header exclusively; no browser OAuth flow is triggered.
- **Onboarding skill removed OAuth step:** `/mem0:onboard` Step 2 no longer guides users through a browser-based OAuth login. The MCP server authenticates via the API key set in Step 1.
- **Removed `claude plugin configure mem0` references:** This CLI command does not exist. The `userConfig` mechanism works through the plugin enable UI prompt — Claude Code prompts for the API key when the plugin is first enabled and stores it securely in the system keychain. Updated session start banner, onboarding skill, identity script comments, and manual testing guide.
## 0.2.6
### Fixed