trellis: Instructions file for Codex

AGENTS.md

trellis AGENTS.md is an instructions file for Codex, OpenCode from terraboops/trellis. It costs 245 tokens per session, scanned A, original, Apache-2.0.

A contributor guide for Trellis, including its required tests, browser checks, pipeline checks, and release steps. Trellis appears to be a Python application served locally on port 8000.

In plain words
What is it for?
Use it when changing Trellis code, especially templates, routes, frontend JavaScript, or pipeline logic, and when preparing a release.
Why use it?
It gives agents a fixed checklist for validating changes before commits and releases. This helps catch failures in the application, user interface, pipelines, and health endpoints.

Instructions file for CodexOpenCode

Written for Codex and OpenCode: the file is AGENTS.md. Also seen: mentions Claude Code.

This is terraboops/trellis's own configuration. It tells Codex and OpenCode how to work on trellis 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 trellis configures →

Reuse

Borrowing it

Nothing to install: this file belongs to terraboops/trellis. 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/terraboops/trellis/main/AGENTS.md
Clone the repo
git clone --depth 1 https://github.com/terraboops/trellis

Made for: Codex, OpenCode.

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 trellis AGENTS.md

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

agentmods 80×15 button for trellis AGENTS.md

Your own site · 80×15
<a href="https://agentmods.dev/instructions/terraboops/trellis/agents-md"><img src="https://agentmods.dev/badge/instructions/terraboops/trellis/agents-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 245 This file is loaded in full into every session.
When invoked 245 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00245 $0.00245
Opus 5.5 $0.00098 $0.00098
Sonnet 5.5 $0.00049 $0.00049
Haiku 4.5 $0.00024 $0.00024

Measured 2mo ago against content hash 4702d9c4a2f3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

trellis AGENTS.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.

AGENTS.md · 34 lines

What it actually says

Trellis Agent Guidelines

Instructions for AI agents (Claude Code, etc.) working in this repository.

Before Every Commit

Run the automated test suite:

.venv/bin/pytest tests/ -x -q

For UI-touching changes (templates, routes, frontend JS), also run the browser test:

/test-trellis

Navigate to the running Trellis instance (default: http://localhost:8000), work through the checklist in the skill, and confirm all pages load correctly before committing.

After Changing Pipeline Logic

Re-run the E2E pipeline tests explicitly:

.venv/bin/pytest tests/test_e2e_pipeline.py tests/test_e2e_web_pipeline.py -v

Release Checklist

Before bumping version and pushing a release:

  1. All tests pass
  2. /test-trellis browser test passes
  3. trellis serve --list-log-formats works
  4. /healthz, /readyz, /metrics endpoints respond correctly
  5. Version bumped in pyproject.toml
  6. Homebrew formula updated in terraboops/homebrew-tap
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 · 34 lines · 245 tokens per session scan A 4702d9c4a2f3

Subscribe to this mod's changes

trellis AGENTS.md is an instructions file published in the GitHub repository terraboops/trellis (2 stars, last pushed 6mo ago), licensed Apache-2.0. It adds 245 tokens to every session, about $0.0010 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.

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