Fitter MCP server
Turn any website or API into structured JSON with LLM-authored declarative scraping configs.
133 stars
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If you have run it, two minutes of your experience saves the next person an afternoon.
Fitter tools
No tool declarations could be read from the package source. They show once the server is installed.
Public scan report
scanner v0.1.9 · 2026-09-21 · same rubric, same numbers if you re-run it
- –Code scanpackage could not be scannedn/a
- –Live reliabilityno gateway calls yet and no remote to proben/a
- –Tool poisoningtools not inspected (local package is not executed); not countedn/a
- Auth qualitylocal package, no credentials required12/15
- Maintenancelast push 23 days ago15/15
- Maintainer identityregistry namespace matches repository owner; GitHub account older than a year8/10
What the publisher says
From the Fitter repository's README, as published. We do not edit it. Read it on GitHub
Fitter — web data for AI agents
Fitter turns any website or API into structured JSON — declaratively. One JSON/YAML config describes where the data lives (HTTP request, headless browser, file, static value) and what to extract (JSON paths, CSS selectors, XPath). No code, no brittle scraping scripts.
🚀 Try it in your browser — the real engine compiled to WebAssembly: live examples, a visual config builder, no install.
Because configs are plain data, LLMs can author them. The built-in MCP server lets Claude Code, Claude Desktop, or any MCP client write and run scraping pipelines on your machine, on demand:
"Get the top 5 HackerNews stories with titles and scores" → the model authors a fitter config, validates it, runs it locally, and gets clean JSON back.
One engine, five ways to use it:
Why fitter for AI agents?
- Declarative & auditable — the agent produces a config you can read, save and re-run, not throwaway code
- Local-first — all fetching happens on your machine; no third-party scraping API, no keys, no per-request billing
- Batteries included — HTTP client, headless browser (Playwright/Chromium/Docker), JSON/HTML/XML/XPath/PDF parsing, pagination, cached references, host rate-limits — in a single static binary
- Reusable — what the agent authored today becomes tomorrow's cron job or service config
How to use Fitter_MCP
Fitter MCP is a Model Context Protocol server (stdio transport) which lets any MCP client — Claude Code, Claude Desktop, IDE assistants, custom agents — run Fitter configs and get structured JSON back.
Quick start (Claude Desktop — one click)
Download fitter-mcp--.mcpb from the release page and open it — Claude Desktop installs the server automatically.
Quick start (Claude Code)
# 1. get the binary: download fitter_mcp_<version>-<os>-<arch> from the release page
# https://github.com/PxyUp/fitter/releases — or build it from source:
go build -o fitter_mcp ./cmd/mcp
# 2. register it once, available in every project
claude mcp add fitter -s user -- "$(pwd)/fitter_mcp"Then just ask:
Get the top 5 HackerNews stories with titles and scores using fitter
The model calls fitterconfigreference, authors a config, optionally checks it with fittervalidateconfig and executes it via fitterrun — all data fetching happens locally on your machine. For a ready-made pipeline try examples/configmorning_briefing.json:
Run examples/configmorningbriefing.json with fitter and give me the briefing
Register in Claude Desktop
Shortened. The full README is on GitHub.
Nothing above is checked by us. What we check is on the safety report.
Install directly
The registry entry has no remote endpoint or installable package.
Fitter: common questions
- Is Fitter MCP server safe?
- Yes, by our scan: it is graded A (88/100). Read the Fitter safety report
- Does Fitter need an API key?
- No secret keys are declared. It reads 7 settings from the environment.
- Is Fitter maintained?
- The last commit was 23 days ago (2026-08-29). The latest release is v1.8.3.
- What can I use instead of Fitter?
- Servers from other publishers that do the same job: Patchloom MCP server and Agent-Native Plan MCP server.
Alternatives to Fitter
Same job from other publishers: the closest match first, then the best rated.
- PatchloomAgent-safe structured edits: JSON/YAML/TOML/md/AST, dry-run, batch/tx. Not a filesystem MCP.not reviewedGrowingB
- Agent-Native PlanStructured visual plans and PR recaps with diagrams, prototypes, annotations, and sharingnot reviewedEstablishedA
