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.
npx skills add oscal-compass-lab/compliance-trestle-skills --skill trestle-governancegit clone --depth 1 https://github.com/oscal-compass-lab/compliance-trestle-skillsWrote 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/skills/oscal-compass-lab/compliance-trestle-skills/trestle-governance)<a href="https://agentmods.dev/skills/oscal-compass-lab/compliance-trestle-skills/trestle-governance"><img src="https://agentmods.dev/badge/skills/oscal-compass-lab/compliance-trestle-skills/trestle-governance/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/skills/oscal-compass-lab/compliance-trestle-skills/trestle-governance"><img src="https://agentmods.dev/badge/skills/oscal-compass-lab/compliance-trestle-skills/trestle-governance.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 | $0.00070 | $0.02633 |
| Opus 5 | $0.00035 | $0.01316 |
| Sonnet 5 | $0.00014 | $0.00527 |
| Haiku 4.5 | $0.00007 | $0.00263 |
Grade A, and why
trestle-governance 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.
How it starts
The opening of the file, as written. The whole thing — 375 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Trestle Document Governance
Trestle has three governance commands. The commands check document structure against templates. Teams can keep a standard document format. Teams can add structure validation to CI/CD pipelines.
Three Governance Commands
| Command | Scope | What It Checks |
|---|---|---|
trestle author headers |
YAML frontmatter only | Header field names, types, and required values |
trestle author docs |
Full markdown documents | Headers + document structure (headings, sections) |
trestle author folders |
Directory structure | Headers + docs + folder layout (same files in each instance) |
Four Modes
Each governance command supports four modes:
| Mode | Purpose | Example |
|---|---|---|
setup |
Create template directory and initial templates | trestle author docs setup -tn my-task |
create-sample |
Generate new instances from templates | trestle author docs create-sample -tn my-task |
template-validate |
Validate the template files themselves | trestle author docs template-validate -tn my-task |
validate |
Validate instance documents against templates | trestle author docs validate -tn my-task |
Template Location
Templates are stored in the trestle workspace under:
.trestle/author/<task-name>/
├── template.md # For docs governance
├── a_template.md # For folders governance
├── another_template.md # Additional folder templates
└── architecture.drawio # Non-markdown templates
Instance documents live at the workspace root:
<task-name>/
├── document_001.md # Created by create-sample
├── document_002.md
└── subfolder/ # For folders governance
├── a_template.md
└── another_template.md
Template Versioning
Templates use x-trestle-template-version in their YAML header to track versions:
---
x-trestle-template-version: 1.0.0
title: ""
description: ""
status: draft
---
If you set --template-version during validation, Trestle checks only documents with that template version.
You can migrate templates in steps.
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.
- 12d ago First seen · 375 lines · 70 tokens per session scan A 8eb4cfb58c5b
trestle-governance is a skill published in the GitHub repository oscal-compass-lab/compliance-trestle-skills (16 stars, last pushed 1mo ago), licensed Apache-2.0. It adds 70 tokens to every session and 2,633 once invoked, about $0.0003 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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