Borrowing it
Nothing to install: this file belongs to agentis-tools/ctx. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/agentis-tools/ctx/main/CLAUDE.mdgit clone --depth 1 https://github.com/agentis-tools/ctxWrote 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.
[](https://agentmods.dev/instructions/agentis-tools/ctx/claude-md)<a href="https://agentmods.dev/instructions/agentis-tools/ctx/claude-md"><img src="https://agentmods.dev/badge/instructions/agentis-tools/ctx/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.
<a href="https://agentmods.dev/instructions/agentis-tools/ctx/claude-md"><img src="https://agentmods.dev/badge/instructions/agentis-tools/ctx/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>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 | $0.00315 | $0.00315 |
| Opus 5.5 | $0.00126 | $0.00126 |
| Sonnet 5.5 | $0.00063 | $0.00063 |
| Haiku 4.5 | $0.00032 | $0.00032 |
Grade C, and why
ctx CLAUDE.md scanned grade C with 1 finding 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 1mo 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.
Hidden instructionshighPrompt injection
Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.
<!-- governance-instructions:v1 --> What it actually says
Claude operating instructions for ctx
Follow AGENTS.md as the root contributor contract. Read
governance/agent-workflow.md before editing
and governance/versioning.md before touching any
compatibility or release surface. docs/ is public product documentation;
internal instructions and maintainer policy belong only under governance/.
ctx-assisted development
Prefer the repository index for code intelligence, then verify against source:
ctx map --budget 2000ctx query find <name>/ctx search <query>ctx source <symbol>/ctx explain <symbol>ctx similar <symbol>before adding an implementationctx checkandctx score --against <base>before handoff
Do not edit generated .claude/hooks/ctx/, .codex/ harness files, plugin
manifests, release notes, lockfile versions, or CLI contract snapshots by hand.
Use their repository scripts. Never bypass a compatibility/version/security
gate or describe a human-review rule as automatically enforced.
Project tracking
Work is tracked in Linear under team agentis (AGE), project ctx:
https://linear.app/itkonsult/project/ctx-7625ddcc6dcb. New repository issues
belong to that team/project when issue creation is explicitly requested.
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.
- 1mo ago First seen · 31 lines · 315 tokens per session scan C 48ff17134bdd
ctx CLAUDE.md is an instructions file published in the GitHub repository agentis-tools/ctx (13 stars, last pushed 6d ago), licensed Apache-2.0. It adds 315 tokens to every session, about $0.0013 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
deepseek-harness AGENTS.md
AGENTS.md instructions for deepseek-ai/deepseek-harness, covering agents.md, pre-stable apis and released session data, repository layout, commands and host sandbox failures.