io.github.fallow-rs/fallow

Fallow

Is the Fallow MCP server down? No. It answered initialize and tools/list in the probe of 2026-11-14.

Codebase intelligence for TypeScript and JavaScript, exposed as structured MCP analysis tools.

alive probed 2026-11-14

44tools

≈ 36ktokens, estimate

≈ 18.2 %of Claude's 200k window

25×the median server

340 msto initialize

11 msto list tools

Run it: npx -y fallow@3.43.0 (stdio, probed in a container with the network off)
Host: npmjs.com
Reports itself as: fallow-mcp 3.43.0
Capabilities: resources, tools
Instructions: 1 461 characters
Of a 1M window: ≈ 3.6 % of a 1M context window, estimate
Claude count: The count_tokens endpoint refused the tool schemas: tools.37.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level. The estimate stands in.
Repository: https://github.com/fallow-rs/fallow
Website: https://fallow.tools/docs/integrations/mcp/
Registry: active, updated 2026-11-13 · registry entry

Most expensive tools

Estimates with the o200k_base tokenizer.

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

conductor io.github.fainir/conductor · alive
recall io.github.fainir/recall · alive
Fairquery Company Jobs Feed io.github.fairquery/company-jobs-feed-mcp · alive
Fairquery Agent Trust & Data Safety io.github.fairquery/fairquery-agent-trust-mcp · alive
LaTeX Look io.github.fangchenghao/latex-look · alive
PanoOn Street View io.github.fanrj3/panoon-mcp · alive
io.github.faridmth/screenshotrender-mcp · alive
io.github.farshadmomo/lan-direct · crashed on start

Servers that mention intelligence or javascript.

Agentic News ai.agentic-news/mcp · needs auth
ai.agentberg/agentberg · alive
ai.astrofabric/mcp · not MCP
ai.bassethound/bassethound · needs auth
Bezal — Local Business Intelligence for AI Agents ai.bezal/local-commerce · alive
BidDeed MCP ai.biddeed/biddeed-mcp · needs auth
China Marketing AI Intelligence MCP ai.chinamarketing/intelligence · needs auth
CreativeScope — Mobile Game Ad Creative Intelligence ai.creativescope/creative-intelligence · alive

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.

This server is in the heaviest 10 % of the registry. Its 5 most expensive tools are 31 % of the cost. Shorter descriptions, fewer optional parameters and fewer tools cut the cost. The command npx mcpcost --url <endpoint> --tools 50 lists every tool with its cost.
The Anthropic count_tokens endpoint refused the tool schemas (tools.37.custom.input_schema: input_schema does not support oneOf, allOf, or anyOf at the top level). A client that validates schemas can refuse them too.