What is unblink CLAUDE.md?

Repository instructions for unblink, a Go-based MCP server that fetches web pages and returns cleaned Markdown to AI agents.

Use it when working on unblink, especially for building, testing, linting, evaluating, or understanding how its web-fetching server is organized.

It gives contributors the project’s architecture, package boundaries, commands, and checks to follow before changing the code.

How ChristopherDavenport/unblink configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to ChristopherDavenport/unblink. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/ChristopherDavenport/unblink/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/ChristopherDavenport/unblink

Made for: Claude Code.

Wrote this? Show the measurements

A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/christopherdavenport/unblink/claude-md/github.svg)](https://agentmods.dev/instructions/christopherdavenport/unblink/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/christopherdavenport/unblink/claude-md"><img src="https://agentmods.dev/badge/instructions/christopherdavenport/unblink/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>

Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/christopherdavenport/unblink/claude-md"><img src="https://agentmods.dev/badge/instructions/christopherdavenport/unblink/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 5,821 This file is loaded in full into every session.

When invoked 5,821 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

Model	Per session	Once invoked
Fable 5.1	$0.05821	$0.05821
Opus 5.5	$0.02328	$0.02328
Sonnet 5.5	$0.01164	$0.01164
Haiku 4.5	$0.00582	$0.00582

Measured 2mo ago against content hash de1462671904, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

unblink CLAUDE.md scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 2mo ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

CLAUDE.md · 306 lines

How it starts

The opening of the file, as written. The whole thing — 306 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.

What this is

unblink is a pure-Go (no cgo, no Chromium) MCP server that exposes the web to AI agents. It fetches a page, parses HTML5, optionally runs the page's JavaScript, strips visual-only junk, and returns clean, token-budgeted Markdown over the Model Context Protocol (stdio). The job is semantic reduction, not rendering.

The single binary is cmd/unblink. The authoritative design doc is docs/architecture.md — read it before any non-trivial change.

Commands

The Makefile is the canonical task runner. CI (.github/workflows/ci.yml) runs the gofmt check, make vet, golangci-lint (.golangci.yml — default linters, errcheck relaxed for idiomatic Close/test handlers, third_party/ exempt), then make test eval on every push/PR. make lint runs the same lint locally (needs the golangci-lint binary).

make build     # go build (version stamped from the nearest v* tag)
make test      # go test ./... (includes every fuzz target's seed corpus)
make eval      # offline in-process MCP eval gate (build tag `eval`; scorecard on stderr)
make wpt       # offline web-platform-tests conformance report (build tag `wpt`; on-demand, not a gate)
make wpt-sync  # refresh the vendored WPT subset in testdata/wpt/ (needs network; local-only)
make fuzz      # coverage-guided fuzzing of the untrusted-input parsers (FUZZTIME=15s each)
make bench     # perf benchmarks over the hot-path packages (narrow: BENCH=regexp, repeat: BENCHCOUNT=N)
make membench  # unblink vs. headless Chromium footprint/latency (scripts/membench, separate module)
make crossbench # membench across every tool in docs/comparison.md incl. token cost (TOOLS=, ARGS=)
make vet       # go vet ./...
make fmt       # gofmt -w .
make tidy      # go mod tidy
make run       # build, then serve MCP over stdio

Run a single test (not in the Makefile — standard Go):

GOTOOLCHAIN=auto go test ./internal/js -run TestName -v
GOTOOLCHAIN=auto go test ./internal/dom -run TestExtract/subtest -v

Read the full file on GitHub · 306 lines

Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

2mo ago First seen · 306 lines · 5,821 tokens per session scan A de1462671904

Subscribe to this mod's changes

unblink CLAUDE.md is an instructions file published in the GitHub repository ChristopherDavenport/unblink (8 stars, last pushed 3mo ago), licensed MIT. It adds 5,821 tokens to every session, about $0.0233 per session on Opus 5.5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.

ai markdown mcp mcp-server

unblink CLAUDE.md next to 6 instructions from other repositories
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unblink CLAUDE.mdChristopherDavenport/unblink	Instructions file	8	3mo ago	MIT	A	5,821	Claude Code
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vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot

unblink: Instructions file for Claude Code