README.md
Structured session journals for AI agents.
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
Tools (8)
log_attemptRecord something that was tried and its outcome.log_blockerFlag something that's stuck and why.resolve_blockerMark a blocker as resolved with what fixed it.log_decisionRecord a design or architecture choice and its rationale.end_sessionClose the current session with an optional summary.get_handoffStructured summary of the last session.get_historyQuery past sessions.get_blockersList unresolved or resolved blockers across all sessions.Environment Variables
MEMOIR_MAX_CONTENTMax characters for content fieldsMEMOIR_MAX_OUTCOMEMax characters for outcome/resolution fieldsMEMOIR_MAX_ENTRIESMax entries per sessionMEMOIR_MAX_SESSIONSMax sessions per projectConfiguration
claude_desktop_config.json
{"mcpServers": {"memoir": {"command": "npx", "args": ["-y", "memoir-mcp"], "env": {"MEMOIR_MAX_SESSIONS": "20"}}}}Try it
→Log that I attempted to refactor the authentication module but it caused a circular dependency.
→What were the blockers identified in the last session?
→Record a decision to use PostgreSQL instead of SQLite for the production database due to scalability requirements.
→Get the handoff summary from my previous session to see where I left off.
→End the current session and summarize the progress made on the API integration.