memoir-mcp

Structured session journals for AI agents. Persistent memory across sessions -- no more repeating dead ends.

When a session ends, all reasoning is lost -- what was tried, what failed, what's blocked. The next session starts from scratch and repeats the same mistakes. memoir logs it all and hands it off so the next session picks up where the last one left off.

Works with any MCP client: Claude Code, Cursor, Codex, Windsurf, and more.

Install

Claude Code

claude mcp add memoir -s user -- npx -y memoir-mcp

Other MCP clients

npx -y memoir-mcp

How it works

• Automatic project detection -- identifies the project by its git root, so logs stay scoped without any configuration.
• Implicit sessions -- a session is created automatically on first log. No setup step.
• Rolling retention -- keeps the last 20 sessions per project (configurable). Old sessions are pruned automatically.

Tools

Write

Tool	Description
log_attempt	Record something that was tried and its outcome.
log_blocker	Flag something that's stuck and why.
resolve_blocker	Mark a blocker as resolved with what fixed it.
log_decision	Record a design or architecture choice and its rationale.
end_session	Close the current session with an optional summary.

Read

Tool	Description
get_handoff	Structured summary of the last session -- what was attempted, what's blocked, what was decided.
get_history	Query past sessions (default: last 3, max 20).
get_blockers	List unresolved (or resolved) blockers across all sessions.

Storage

Single SQLite file at ~/.memoir/memoir.db. No API keys, no external services.

Configuration

All limits are configurable via environment variables:

Variable	Default	Description
MEMOIR_MAX_CONTENT	500	Max characters for content fields
MEMOIR_MAX_OUTCOME	300	Max characters for outcome/resolution fields
MEMOIR_MAX_ENTRIES	50	Max entries per session
MEMOIR_MAX_SESSIONS	20	Max sessions per project (rolling)

Example with custom limits:

claude mcp add memoir -s user -e MEMOIR_MAX_CONTENT=1000 -e MEMOIR_MAX_ENTRIES=100 -- npx -y memoir-mcp

Handoff output uses a compact format to keep context window usage low.

License

MIT