Gemini Memory Extension

Gemini CLI extension that saves and retrieves project memory from local SQLite, with MCP tools that share the same memory DB.

Official Gemini docs this README follows:

• Writing extensions: https://geminicli.com/docs/extensions/writing-extensions/
• Releasing extensions: https://geminicli.com/docs/extensions/releasing/

What You Get

• Hook-based memory capture (AfterAgent) and retrieval (BeforeAgent, SessionStart)
• Slash commands for memory inspection and cleanup
• Optional MCP server tools for external agents/clients
• Local per-project storage by default:

${HOME}/.gemini/gemini-mem/<repo-folder>/memory.db

Quick Start (Use This Extension)

npm install
npm run build
gemini extensions link .
gemini extensions list

Then restart Gemini CLI.

Daily Dev Loop

1. Edit code.
2. Rebuild: npm run build
3. Test: npm test
4. Restart Gemini CLI to pick up changes.

Project Layout

src/
  hooks/      # SessionStart, BeforeAgent, AfterAgent
  memory/     # sqlite store, schema, retrieval, dedupe, redaction
  gemini/     # summarizer/reranker prompts + validators
  commands/   # mem-status, mem-search, mem-last, mem-prune
  mcp/        # stdio and HTTP MCP servers + tool handlers
  runtime/    # process and Gemini CLI adapters
  cli/        # db init/migration scripts

Slash Commands

• /mem:status
• /mem:search <query>
• /mem:last [limit]
• /mem:prune [maxAgeDays] [importanceFloor]

Local equivalents:

npm run mem:status
npm run mem:status -- --json
npm run mem:search -- "query text"
npm run mem:last -- 5
npm run mem:last -- 5 --json
npm run mem:prune -- 30 2

MCP Tools

MCP is decoupled from hook runtime in this extension build. Hook execution does not require MCP server discovery.

• memory_status
• memory_get_context
• memory_search
• memory_save_observation
• memory_cite
• memory_end_session

Run transports:

npm run mcp:server
npm run mcp:http

If you want Gemini CLI to auto-discover this MCP server, register it explicitly in your user/project Gemini MCP settings.

Default HTTP endpoint:

http://127.0.0.1:3303/mcp

Recommended MCP usage order:

1. memory_get_context
2. memory_save_observation
3. memory_end_session

Config

Settings are defined in gemini-extension.json (DB path, model, limits, timeouts, project mode, command override).

Opt-in hook telemetry:

• Set MEM_HOOK_TELEMETRY=true
• Writes JSONL events and failures to <project-db-folder>/hook.log (for example ${HOME}/.gemini/gemini-mem/<repo>/hook.log)

Release Checklist (What To Do)

This repo already has workflows in .github/workflows/ and release notes in PUBLISHING.md.

1. Update version in both files:
   • package.json
   • gemini-extension.json
2. Validate locally:
   • npm run build
   • npm test
3. Commit and tag:
   • git tag vX.Y.Z
   • git push origin main --tags
4. Let GitHub Actions create/publish the release artifacts.
5. Install test from users' perspective:
   • gemini extensions install <repo-url>
   • or gemini extensions install <repo-url> --ref=vX.Y.Z

For gallery discoverability (from official docs):

• Keep repository public.
• Add GitHub topic gemini-cli-extension.
• Keep gemini-extension.json at repository root.

Verification Commands

npm run build
npm test
npm run test:hooks
npm run test:mcp
npm run test:mcp-http

Contributing

See CONTRIBUTING.md.