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colin: Instructions file for Claude Code

CLAUDE.md

colin CLAUDE.md is an instructions file for Claude Code from PrefectHQ/colin. It costs 755 tokens per session, scanned A, original, no licence file.

Claude Code instructions for the PrefectHQ/colin project. They cover development rules, required workflow, documentation, user-facing docs, and the architecture document.

In plain words
What is it for?
Use them when developing colin, especially when changing its code, documentation, or architecture guidance.
Why use it?
They tell the coding agent how changes should be made and documented in this repository, reducing inconsistent project work.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md.

This is PrefectHQ/colin's own configuration. It tells Claude Code how to work on colin itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything colin configures →

not rated 124repo 3mo ago A scan 755 tokens no licence
View source ↗ PrefectHQ/colin colin.prefect.io
Reuse

Borrowing it

Nothing to install: this file belongs to PrefectHQ/colin. 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/PrefectHQ/colin/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/PrefectHQ/colin

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.

agentmods badge for colin CLAUDE.md

README.md
[![agentmods](https://agentmods.dev/badge/instructions/prefecthq/colin/claude-md/github.svg)](https://agentmods.dev/instructions/prefecthq/colin/claude-md)
Your own site
<a href="https://agentmods.dev/instructions/prefecthq/colin/claude-md"><img src="https://agentmods.dev/badge/instructions/prefecthq/colin/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.

agentmods 80×15 button for colin CLAUDE.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/prefecthq/colin/claude-md"><img src="https://agentmods.dev/badge/instructions/prefecthq/colin/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 755 This file is loaded in full into every session.
When invoked 755 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 unknown 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00755 $0.00755
Opus 5.5 $0.00302 $0.00302
Sonnet 5.5 $0.00151 $0.00151
Haiku 4.5 $0.00076 $0.00076

Measured 2mo ago against content hash cb67f37f1ba3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

colin 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 · 93 lines

The source is not reproduced here

No licence file

A repository with no LICENSE is all rights reserved by default, so the body is not copied here. The metadata, the measurements and the link are.

Read it on GitHub

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.

  1. 2mo ago First seen · 93 lines · 755 tokens per session scan A cb67f37f1ba3

Subscribe to this mod's changes

colin CLAUDE.md is an instructions file published in the GitHub repository PrefectHQ/colin (124 stars, last pushed 3mo ago), with no licence file. It adds 755 tokens to every session, about $0.0030 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 2026-08-30.

agentagent-skillsclaudeclaude-skillscontextcontext-engineering
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