Borrowing it
Nothing to install: this file belongs to LenoSeibert/semver-plugin. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/LenoSeibert/semver-plugin/main/AGENTS.mdgit clone --depth 1 https://github.com/LenoSeibert/semver-pluginWrote 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/instructions/lenoseibert/semver-plugin/agents-md)<a href="https://agentmods.dev/instructions/lenoseibert/semver-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/lenoseibert/semver-plugin/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.
<a href="https://agentmods.dev/instructions/lenoseibert/semver-plugin/agents-md"><img src="https://agentmods.dev/badge/instructions/lenoseibert/semver-plugin/agents-md.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 | $0.00274 | $0.00274 |
| Opus 5.5 | $0.00110 | $0.00110 |
| Sonnet 5.5 | $0.00055 | $0.00055 |
| Haiku 4.5 | $0.00027 | $0.00027 |
Grade A, and why
semver-plugin 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.
What it actually says
Semantic Versioning 2.0.0
When a task concerns release versions, apply the official Semantic Versioning 2.0.0 specification. Base the decision on changes to the declared public API, not on commit labels, diff size, or perceived importance.
- Incompatible public API change: increment
MAJOR; reset minor and patch. - Backward-compatible functionality or deprecation: increment
MINOR; reset patch. - Backward-compatible bug fix only: increment
PATCH. 0.y.zis initial development and may change at any time. Follow a project's documented pre-1.0 policy; do not invent one and call it a SemVer rule.- Never modify an artifact after its version has been released.
- Normal versions are
X.Y.Z, use non-negative integers, and have no leading zeroes. - Pre-releases rank below the associated normal version. Compare numeric identifiers numerically, non-numeric identifiers lexically in ASCII, and numeric identifiers below non-numeric ones.
- Ignore build metadata when comparing precedence.
Inspect the public API and actual changes before recommending a version. Lead
with the minimum safe version or bump and briefly cite the compatibility
evidence. Use the bundled semver and semver-review skills for detailed work.
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.
- 2mo ago First seen · 24 lines · 274 tokens per session scan A 5d7b3637b033
semver-plugin AGENTS.md is an instructions file published in the GitHub repository LenoSeibert/semver-plugin (1 stars, last pushed 3mo ago), licensed MIT. It adds 274 tokens to every session, about $0.0011 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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