trellis-spec-review

trellis-spec-review is an agent for Claude Code from LonelyHerbivore/Trellis-Herbivore. It costs 32 tokens per session (1,105 once invoked), scanned A, original, AGPL-3.0.

A specification-review agent for Claude Code, a tool that helps developers write software. It checks whether changes match the task materials and the project's Trellis specifications.

In plain words
What is it for?
Use it as a review gate after implementation to compare code changes with task artifacts and Trellis specifications.
Why use it?
It helps detect work that technically runs but does not follow the agreed requirements or project rules.

Agent for Claude Code

Written for Claude Code: a Claude Code subagent (agents/*.md). Also seen: model in frontmatter.

Good fit Use it as a review gate after implementation to compare code changes with task artifacts and Trellis specifications.

Compare 6 agents from other repositories ↓
Install with agentmods
npx agentmods add agents/lonelyherbivore/trellis-herbivore/trellis-spec-review
Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

Clone the repo
git clone --depth 1 https://github.com/LonelyHerbivore/Trellis-Herbivore

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 trellis-spec-review

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

Your own site · 80×15
<a href="https://agentmods.dev/agents/lonelyherbivore/trellis-herbivore/trellis-spec-review"><img src="https://agentmods.dev/badge/agents/lonelyherbivore/trellis-herbivore/trellis-spec-review.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 32 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 1,105 The whole file, excluding the scripts and references it only reads on demand.
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 $0.00032 $0.01105
Opus 5 $0.00016 $0.00553
Sonnet 5 $0.00006 $0.00221
Haiku 4.5 $0.00003 $0.00111

Measured 12d ago against content hash f0c1212c3bc9, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-11, from the pricing page.

Security

Grade A, and why

trellis-spec-review 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 12d 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.

packages/cli/src/templates/claude/agents/trellis-spec-review.md · 89 lines

The source is not reproduced here

Licensed AGPL-3.0

The repository is licensed AGPL-3.0, which this catalogue does not treat as permission to reproduce the file. Read it at the source.

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. 12d ago First seen · 89 lines · 32 tokens per session scan A f0c1212c3bc9

Subscribe to this mod's changes

trellis-spec-review is an agent published in the GitHub repository LonelyHerbivore/Trellis-Herbivore (95 stars, last pushed 18d ago), licensed AGPL-3.0. It adds 32 tokens to every session and 1,105 once invoked, about $0.0002 per session on Opus 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.

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