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 sethclawd-prog/schemaguard --skill skillgit clone --depth 1 https://github.com/sethclawd-prog/schemaguardWrote 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/sethclawd-prog/schemaguard/skill)<a href="https://agentmods.dev/skills/sethclawd-prog/schemaguard/skill"><img src="https://agentmods.dev/badge/skills/sethclawd-prog/schemaguard/skill/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/sethclawd-prog/schemaguard/skill"><img src="https://agentmods.dev/badge/skills/sethclawd-prog/schemaguard/skill.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 | $0.00049 | $0.00436 |
| Opus 5.5 | $0.00020 | $0.00174 |
| Sonnet 5.5 | $0.00010 | $0.00087 |
| Haiku 4.5 | $0.00005 | $0.00044 |
Grade A, and why
schemaguard 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 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.
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.
What it actually says
SchemGuard — API Schema Drift Monitor
Quick Start
# Diff two specs (breaking vs non-breaking)
npx @sethclawd/schemaguard diff old.yaml new.yaml
# CI check (exit 0=safe, 1=breaking, 2=error)
npx @sethclawd/schemaguard ci --spec ./openapi.yaml --baseline ./baseline.yaml
# Lint spec quality
npx @sethclawd/schemaguard lint ./openapi.yaml
# JSON output for programmatic use
npx @sethclawd/schemaguard diff old.yaml new.yaml --format json
When to Use
- Before committing changes to an OpenAPI spec
- When reviewing PRs that modify API routes
- After generating/updating OpenAPI specs from code
- Before deploying API changes to production
- Validating that a migration maintains backward compatibility
Breaking Changes Detected
| Rule | What It Catches |
|---|---|
endpoint-removed |
Deleted endpoints |
required-param-added |
New required parameters |
field-type-changed |
Changed field types |
response-field-removed |
Removed response fields |
enum-value-removed |
Narrowed enums |
auth-requirement-changed |
Changed security schemes |
Non-Breaking (Info Only)
Added endpoints, optional params, response fields, widened enums, deprecations.
MCP Server
For direct tool integration:
npx @sethclawd/schemaguard --mcp
Exposes: schemaguard_diff, schemaguard_lint, schemaguard_check
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 · 59 lines · 49 tokens per session scan A 160cbd0080a9
schemaguard is a skill published in the GitHub repository sethclawd-prog/schemaguard (0 stars, last pushed 8mo ago), licensed MIT. It adds 49 tokens to every session and 436 once invoked, about $0.0002 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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