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 agentmods add instructions/s2-streamstore/tailsurf/agents-mdgit clone --depth 1 https://github.com/s2-streamstore/tailsurfWrote 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/s2-streamstore/tailsurf/agents-md)<a href="https://agentmods.dev/instructions/s2-streamstore/tailsurf/agents-md"><img src="https://agentmods.dev/badge/instructions/s2-streamstore/tailsurf/agents-md.svg" alt="Measured on agentmods" 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 | $0.00161 | $0.00161 |
| Opus 5 | $0.00081 | $0.00081 |
| Sonnet 5 | $0.00032 | $0.00032 |
| Haiku 4.5 | $0.00016 | $0.00016 |
Grade A, and why
tailsurf 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 today.
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
Agent Instructions
- Use
--lockedfor Cargo commands that build, check, test, run, document, fetch, or read metadata. - Use
cargo +nightly add,cargo +nightly update,cargo +nightly remove, orcargo +nightly generate-lockfilefor dependency changes. - Do not use stable Cargo for dependency changes.
- Do not edit dependency declarations or
Cargo.lockdirectly. - Do not run
cargo installas part of a coding task. - Run Rust formatting with
cargo +nightly fmt --all --check. - Run Rust tests with
cargo test --locked --workspace --all-targets. - Run Rust linting with
cargo clippy --locked --workspace --all-targets -- -D warnings.
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.
- today First seen · 11 lines · 161 tokens per session scan A 4f7c02a28d82
tailsurf AGENTS.md is an instructions file published in the GitHub repository s2-streamstore/tailsurf (13 stars, last pushed yesterday), licensed MIT. It adds 161 tokens to every session, about $0.0008 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 2026-09-05.
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