feat: add Mem0 plugin for Claude Code and Cursor (#4518)

mem0-plugin/scripts/on_session_start.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+# Hook: SessionStart (matcher: startup|resume|compact)
+#
+# Bootstraps mem0 context at the start of every session.
+# Output becomes part of Claude's context so it calls mem0 MCP tools.
+#
+# Input:  JSON on stdin with session_id, source, transcript_path, model, cwd
+# Output: Text injected into Claude's context (exit 0)
+
+# Intentionally omit -e so the script always outputs a bootstrap prompt
+# even if jq is missing or stdin is malformed.
+set -uo pipefail
+
+INPUT=$(cat)
+SOURCE=$(echo "$INPUT" | jq -r '.source // "startup"' 2>/dev/null || echo "startup")
+
+if [ "$SOURCE" = "startup" ]; then
+  cat <<'EOF'
+## Mem0 Session Bootstrap
+
+You have access to persistent memory via the mem0 MCP tools. Before doing anything else:
+
+1. Call `search_memories` with a query related to the current project or user request to load relevant context.
+2. Review the returned memories to understand what has been learned in prior sessions.
+3. If appropriate, call `get_memories` to browse all stored memories for this user.
+
+IMPORTANT: Do NOT skip this step. Always bootstrap context first.
+EOF
+
+elif [ "$SOURCE" = "resume" ]; then
+  cat <<'EOF'
+## Mem0 Session Resumed
+
+This is a resumed session. Your prior context is already loaded. Before continuing:
+
+1. Call `search_memories` with a query related to the current task to refresh relevant memories.
+2. If significant time has passed, search for recent project-wide updates.
+
+Continue where you left off.
+EOF
+
+elif [ "$SOURCE" = "compact" ]; then
+  cat <<'EOF'
+## Mem0 Post-Compaction Recovery
+
+Context was just compacted. You may have lost important session context.
+
+1. Call `search_memories` with queries related to what you were working on to reload relevant knowledge.
+2. Check for any session state memories that were saved before compaction.
+3. Continue working based on the recovered context.
+EOF
+fi
+
+exit 0