io.github.Filippo-Venturini/ctxvault

CtxVault

Is the CtxVault MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-11.

Local memory for AI agents: semantic, skill and episodic vaults as plain folders on disk.

alive probed 2026-11-15 · unchanged since 2026-11-11

17tools

4.4ktokens in Claude Opus 5.5

2.2 %of Claude's 200k window

1.7×the median server

3.4 sto initialize

10 msto list tools

Run it: uvx ctxvault@0.9.1 (stdio, probed in a container with the network off)
Host: pypi.org
Reports itself as: ctxvault 1.30.0
Capabilities: experimental, prompts, resources, tools
Instructions: none
Of a 1M window: 0.4 % of a 1M context window
Count: 4.4k tokens in Claude Opus 5.5, exact, measured 2026-11-11. With the Claude Code prefix mcp__…__ on each tool name: 4.5k. The o200k_base estimate is 2.4k. Counted again when the tool definitions change. Method.
Repository: https://github.com/Filippo-Venturini/ctxvault
Website: https://filippo-venturini.github.io/ctxvault/
Registry: active, updated 2026-11-10 · registry entry

Most expensive tools

The Claude column scales the o200k estimate of each tool by this server's ratio of exact to estimate, 1.78×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
query_episodes	458	257	11 %
write_episode	453	254	10 %
revise_episode	401	225	9 %
supersede_episode	373	209	9 %
list_entities	360	202	8 %

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

Servers that mention episodic or semantic.

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.