Space Memory

Start with any agent. Continue with any other.

Space Memory is an open-source shared memory and workspace layer for AI agents. It persists attributable memories in an append-only event journal and lets multiple agent-specific keys access the same isolated Space through MCP or HTTP.

Early development preview. The current vertical slice proves durable memory, cross-agent reads, restart recovery, idempotency, optimistic concurrency, MCP tools, and the first living-brain web surface. It is not ready for production secrets.

What works now

• Bearer keys stored as hashes

• Separate agents sharing one Space

• Append-only event journal

• Durable memory projection

• Keyword search without bundled AI

• Idempotent create/update operations

• Atomic optimistic version checks (409 on stale writes)

• Cursor-based event catch-up after restart

• Per-credential rate limiting (sliding window, 429 + Retry-After)

• Lifecycle CLI (space-memory start|stop|status|restart) with PID + cmdline verification

• Authenticated web panel: Space-key login, validated against the same Bearer contract, with explicit invalid/offline/empty states and logout

• MCP Streamable HTTP tools:

  • memory_remember

  • memory_search

  • project_resume

  • events_after

• Locked dependency graph (uv.lock)

• Animated Canvas dashboard with accessible textual fallback

Related MCP server: memento-mcp-server

Development

Requires Python 3.11+.

python -m venv .venv
.venv/bin/pip install -e '.[dev]'
.venv/bin/pytest

Configure

Copy .env.example to .env and set a real pepper (generate once and keep it in your secret store):

cp .env.example .env
# set SPACE_MEMORY_TOKEN_PEPPER (e.g. `openssl rand -hex 32`)

The server and CLI auto-load .env from the current working directory. See .env.example for every supported variable.

Run via the lifecycle CLI

.venv/bin/space-memory start     # background, health-checked, PID tracked
.venv/bin/space-memory status
.venv/bin/space-memory stop      # verifies the PID is a Space Memory process first
.venv/bin/space-memory restart

stop never kills by port: it reads the PID file and checks /proc/<pid>/cmdline before signalling, so an unrelated process that reused a stale PID is left alone.

Run manually (alternative)

mkdir -p data
export SPACE_MEMORY_TOKEN_PEPPER="replace-with-a-random-secret"
export SPACE_MEMORY_BOOTSTRAP_TOKEN="spm_local_replace_me"
export SPACE_MEMORY_SPACE_ID="my-space"
export SPACE_MEMORY_AGENT_ID="my-agent"
.venv/bin/uvicorn space_memory.main:app --host 127.0.0.1 --port 8787

Open:

• Panel: http://127.0.0.1:8787

• MCP: http://127.0.0.1:8787/mcp/

• Health: http://127.0.0.1:8787/health

Never expose this development configuration directly to the internet. Production installation, PostgreSQL, TLS, admin onboarding, encrypted vault, backups, and signed installers are planned but not implemented yet.

Architecture and product record

• Product definition

• First vertical slice

License

MIT