io.github.skynetcmd/m3-memory

M3 Memory

Is the M3 Memory MCP server down? No. It answered initialize and tools/list in the probe of 2026-10-26.

Local-first, cloud-friendly memory — 100+ tools, 99.2% LongMemEval-S retrieval@8, hybrid search.

alive probed 2026-11-14 · unchanged since 2026-10-26

6tools

5.4ktokens in Claude Opus 5.5

2.7 %of Claude's 200k window

2.1×the median server

4.7 sto initialize

6 msto list tools

Run it: uvx m3-memory@2026.10.25.0 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: Memory Bridge 1.30.0
Capabilities: experimental, prompts, resources, tools
Instructions: 2 602 characters
Of a 1M window: 0.5 % of a 1M context window
Count: 5.4k tokens in Claude Opus 5.5, exact, measured 2026-10-26. With the Claude Code prefix mcp__…__ on each tool name: 5.4k. The o200k_base estimate is 3.2k. Counted again when the tool definitions change. Method.
Repository: https://github.com/skynetcmd/m3-memory
Website: https://github.com/skynetcmd/m3-memory
Registry: active, updated 2026-10-26 · registry entry
Changes: 3 recorded, reachable in 3 of them. A row is added when the result, the tool count or the cost changes.

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.70×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
memory_supersede	1 431	842	27 %
memory_search	1 332	784	25 %
memory_write	1 244	732	23 %
m3_call	574	338	11 %
chatlog_search	542	319	10 %

Other registry entries on pypi.org, the ones next to this name; all of them.

Magg io.github.sitbon/magg · alive
Reversecore MCP io.github.sjkim1127/reversecore-mcp · alive
skforecast-ai io.github.skforecast/skforecast-ai · needs args
email-tool io.github.skhan61/email-tool · alive
zspace-cli io.github.skyzhao1223/zspace-cli · crashed on start
SlashML (/ml) Embodied Robotics 6-DoF Spatial Memory io.github.slashml-ai/slashml-robotics · install failed
io.github.sleepycobalt/motif · needs args
Calculator io.github.slettmayer/calc-mcp-server · alive

Servers that mention memory.

We add a row when the result changes. A server with no change keeps its last row.

Probed	Result	Init	Tools	Claude	o200k
2026-10-26 07:06	alive	4.7 s	6	5.4k	3.2k
2026-10-24 06:34	alive	2.8 s	6		3.2k
2026-10-17 06:19	alive	4.7 s	10	4.7k	2.6k

The result of the latest probe, the tool count and the token cost. The feed has an entry for every probe that changed them.

Stops answering, comes back, tool set or cost changes. One confirmation mail first, a stop link in every mail.