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/AGENTS.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/agents-md)<a href="https://agentmods.dev/instructions/agentis-tools/ctx/agents-md"><img src="https://agentmods.dev/badge/instructions/agentis-tools/ctx/agents-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/agents-md"><img src="https://agentmods.dev/badge/instructions/agentis-tools/ctx/agents-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 | $0.00566 | $0.00566 |
| Opus 5.5 | $0.00226 | $0.00226 |
| Sonnet 5.5 | $0.00113 | $0.00113 |
| Haiku 4.5 | $0.00057 | $0.00057 |
Grade C, and why
ctx AGENTS.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 --> How it starts
The opening of the file, as written. The whole thing — 55 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ctx contributor instructions
ctx is the agentis-ctx Rust package and installs the ctx binary. The root
package is not a Cargo workspace; perf/ is an isolated, unpublished harness.
Rust 1.91 is the minimum supported version and the edition is 2021.
Read before changing the repository
governance/agent-workflow.mddefines the contributor workflow.governance/versioning.mdis the canonical SemVer and compatibility policy.governance/guardrails.mddistinguishes automated enforcement from human review.governance/releasing.mdis maintainer-only release procedure.
docs/ is public product documentation and the user manual. Internal policy,
maintainer procedures, CI governance, and agent rules belong in governance/,
never in docs/.
Invariants
- Root
Cargo.toml[package].versionis the only manually edited product version. Usepython3 scripts/version.py; do not hand-edit lockfile versions. - Ordinary PRs do not bump versions. Release preparation must use the tooling, update reviewed changelog notes, and receive the required labels/review.
- Treat CLI flags/defaults, JSON, config, persisted schemas/indexes, Rust API, MCP/plugins, exits, platforms/packaging, and self-update as contracts.
- Add an Unreleased
CHANGELOG.mdentry for product behavior. Never hide a break in prose or update a contract snapshot without reviewing SemVer impact. - Generated harness hooks/plugins/checksums/release notes are not hand-edited.
- Never tag, publish, release, push unrelated changes, weaken gates, or change repository settings without explicit authorization.
Validation
python3 scripts/version.py show
python3 scripts/check-governance.py check
python3 -m unittest discover -s tests/versioning -p 'test_*.py'
cargo fmt --all -- --check
cargo clippy --all-targets --all-features -- -D warnings
cargo test --locked --all-features
cargo test --locked --no-default-features
scripts/ci.sh
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 · 55 lines · 566 tokens per session scan C cec3c97e6ef2
ctx AGENTS.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 566 tokens to every session, about $0.0023 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.