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Catalogmcp

Filesystem MCP

situationalSteady momentum

Official MCP reference server that exposes a local directory to the agent.

Visit github.com →Add to kitOpen in Noemium

ledger entry · observed by @whysanesanders

The teaching example: an allowlisted folder over stdio. Fine for a demo, and still the snippet every mcp.json tutorial copies. Most coding agents already have files; adding this is extra disk surface, not a new capability.

Strengths

  • Official reference from the MCP steering group, not a random registry listing.
  • Allowlist is a path argument — you can keep it smaller than $HOME.
  • Zero cost, MIT, npx one-liner.

Known limitations

  • Lives in the reference-servers repo, not a product with a support desk.
  • stdio process can read whatever you allowlisted — the allowlist is the security model.
  • Does not replace a coding agent's own file tools.

Use it when

  • A first MCP install to prove the client actually talks stdio.
  • Agents that are not already sitting inside the repo they need to read.

Skip it when

  • The agent already has workspace tools (Claude Code, Cursor, Codex, Aider).
  • You would pass $HOME or / as the allowed path.
  • You needed a package manager for many servers — that is Pharos, not this.

Buy-check

  • ·Price — free, MIT reference; npx -y @modelcontextprotocol/server-filesystem <allowed-dir> as of 2026-08-26. Open the pricing page, not a screenshot.
  • ·Free tier — Free tier exists — burn it first.
  • ·Cancel fallout — What happens to your data/projects on cancel — check the ToS, not the FAQ.
  • ·Seat math — Per-seat pricing multiplies quietly. Count seats before the annual plan.
  • ·Who skips it — Also skipped when: The agent already has workspace tools (Claude Code, Cursor, Codex, Aider).; You would pass $HOME or / as the allowed path..

Price trailchangelog →

No price move in this repo yet.

Facts

pricing
free1
price note
MIT reference; npx -y @modelcontextprotocol/server-filesystem <allowed-dir>
free tier
yes
open source
yes
api
no
self-host
yes
category
mcp
evidence
source-verified

Data: trains on inputs no · local processing yes

Sources

  1. 1github.com/modelcontextprotocol/servers[snapshot]

No source, no number.

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