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 cyberelf/agent_skills --skill openspec-constitution-guardgit clone --depth 1 https://github.com/cyberelf/agent_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/cyberelf/agent_skills/openspec-constitution-guard)<a href="https://agentmods.dev/skills/cyberelf/agent_skills/openspec-constitution-guard"><img src="https://agentmods.dev/badge/skills/cyberelf/agent_skills/openspec-constitution-guard/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/cyberelf/agent_skills/openspec-constitution-guard"><img src="https://agentmods.dev/badge/skills/cyberelf/agent_skills/openspec-constitution-guard.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 | $0.00072 | $0.03301 |
| Opus 5 | $0.00036 | $0.01650 |
| Sonnet 5 | $0.00014 | $0.00660 |
| Haiku 4.5 | $0.00007 | $0.00330 |
Grade C, and why
openspec-constitution-guard 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 9d 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.
2. Look for `<!-- CONSTITUTION-GUARD:START` marker in the config file 3. If marker is missing → first-time setup needed 4. If AGENTS.md files have changed since `Last Updated` date → refresh needed ## Workflow ### Step 1 How it starts
The opening of the file, as written. The whole thing — 428 lines — stays where its author put it; the contents beside it link to each section on GitHub.
OpenSpec Constitution Guard
This skill ensures OpenSpec workflows enforce project-specific quality assurance criteria derived from AGENTS.md constitution files by injecting them into openspec/config.yaml.
Purpose
OpenSpec workflows (/opsx:apply, /opsx:verify, /opsx:archive, etc.) include generic validation. This skill enriches them with project-specific quality gates extracted from AGENTS.md files across the workspace, ensuring all artifacts pass the project's defined testing and QA criteria before handoff.
When to Use
Trigger this skill when:
- Initializing openspec for the first time in a project (
openspec init) - An AGENTS.md file is created, modified, or deleted in the project
- User explicitly requests to sync constitution quality gates with openspec config
- Validating that openspec configuration is up-to-date with constitution requirements
Detection: When to Run
To detect if guards need composition:
- Check if
openspec/config.yamlexists - Look for
<!-- CONSTITUTION-GUARD:STARTmarker in the config file - If marker is missing → first-time setup needed
- If AGENTS.md files have changed since
Last Updateddate → refresh needed
Workflow
Step 1: Locate All Constitution Files
Find all AGENTS.md files in the workspace:
find . -name "AGENTS.md" -type f | grep -v node_modules | grep -v .venv | grep -v target | grep -v openspec/AGENTS.md
Exclude openspec/AGENTS.md as it contains OpenSpec usage instructions already referenced by the system, not project-specific quality criteria.
Read each remaining file to understand its scope (root project, backend, frontend, specific module, etc.).
Step 2: Read and Understand Quality Criteria
For each AGENTS.md file, identify sections related to quality assurance. Look for:
- Headings containing: "Quality", "Testing", "Checks", "Validation", "Assurance", "Checklist"
- Command examples (typically in backticks or code blocks)
- Goals or acceptance criteria (e.g., "Zero errors", "All tests pass")
- Architecture patterns and coding standards that should be enforced
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.
- 9d ago First seen · 428 lines · 72 tokens per session scan C 0308aacff262
openspec-constitution-guard is a skill published in the GitHub repository cyberelf/agent_skills (2 stars, last pushed 13d ago), licensed MIT. It adds 72 tokens to every session and 3,301 once invoked, about $0.0004 per session on Opus 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 2026-08-31.
Other skills, from other repositories
systematic-debugging
Use when encountering any bug, test failure, or unexpected behavior, before proposing fixes.
local-ai-agents
Build local-first AI agents that run entirely on a developer workstation with Microsoft Foundry Local and Qwen function-calling models. Covers Small Language Models (SLMs), the OpenAI-compatible local endpoint, sandboxed local tools, local RAG with Chroma, local MCP servers, hybrid cloud/local routing, and the…
next-cache-components-adoption
Turn on Cache Components in a Next.js app and resolve the blocking routes it surfaces. Use when the user wants to enable, adopt, or migrate to Cache Components, flip the cacheComponents flag, work through a flood of blocking-prerender / instant validation errors, run the cache-components-instant-false codemod, or…
insight-error-page
Write or audit an insight-kind error page for the Next.js dev overlay. Use when creating a new errors/ .mdx page, auditing an existing one, or checking that a page matches the framework fix cards. Covers page structure, title alignment, FixCard cards with Copy prompt button, code snippets, terminology verification…
next-cache-components-optimizer
Drive a Next.js route to instant navigation by setting up an agentic loop, under Cache Components / PPR, on initial load (hard navigation) and client-side navigation (soft navigation). Encode the goal as a failing @next/playwright instant() e2e and work it to green, one verified route at a time; the shipped test then…
next-partial-prefetching-adoption
Turn on Partial Prefetching in a Next.js app and work through the insights it surfaces. Use when the user wants to enable or adopt Partial Prefetching, flip the partialPrefetching flag, opt routes in with export const prefetch = 'partial', audit Link prefetch={true} behavior, preserve existing prefetched UI with…