io.github.mrfentmen/toolchain-lens-mcp

toolchain-lens-mcp

Is the io.github.mrfentmen/toolchain-lens-mcp MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-09.

Local explanation of reproducibility signals MCP: real tools for real work.

alive probed 2026-11-15 · unchanged since 2026-11-09

3tools

651tokens in Claude Opus 5.5

0.3 %of Claude's 200k window

0.3×the median server

259 msto initialize

6 msto list tools

Run it: npx -y toolchain-lens-mcp@1.0.1 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: toolchain-lens-mcp 1.0.0
Capabilities: tools
Instructions: none
Of a 1M window: <0.1 % of a 1M context window
Count: 651 tokens in Claude Opus 5.5, exact, measured 2026-11-09. With the Claude Code prefix mcp__…__ on each tool name: 699. The o200k_base estimate is 362. Counted again when the tool definitions change. Method.
Repository: https://github.com/mrfentmen/awesome-servers
Registry: active, updated 2026-11-08 · 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, 1.80×.

Tool	≈ Claude tokens	o200k estimate	Share of this server
check_toolchain_declarations	254	141	39 %
reproducibility_gap_matrix	236	131	36 %
explain_toolchain	162	90	25 %

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

Servers that mention toolchain.

Kujolang.ai MCP io.github.kujolang/kujolang-mcp · newer protocol
DualSPHysics MCP io.github.vegetableno1/dualsphysics · alive
io.github.thlg057/mo5-mcp-server · alive
LiteScope io.github.croc100/litescope · crashed on start
meek_3d_print_toolchain_mcp io.github.CSOAI-ORG/meek_3d_print_toolchain_mcp · crashed on start
Eclipse Thread MCP io.github.CYAN-ECLIPSE-TECHNOLOGIES-LLC/thread · not probed
Embedded / IoT Mentor io.github.mh-mansouri/embedded-iot-mentor · not probed
IterxAI CLI io.github.jrenc2002/iterx · alive

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

Probed	Result	Init	Tools	Claude	o200k
2026-11-09 08:50	alive	217 ms	3	651	362
2026-10-27 06:59	alive	194 ms	1	166	90
2026-10-20 06:44	alive	259 ms	1		90

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.