Borrowing it
Nothing to install: this file belongs to wyattjoh/herdr-plugin-renamer. 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/wyattjoh/herdr-plugin-renamer/main/CLAUDE.mdgit clone --depth 1 https://github.com/wyattjoh/herdr-plugin-renamerWrote 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/wyattjoh/herdr-plugin-renamer/claude-md)<a href="https://agentmods.dev/instructions/wyattjoh/herdr-plugin-renamer/claude-md"><img src="https://agentmods.dev/badge/instructions/wyattjoh/herdr-plugin-renamer/claude-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/wyattjoh/herdr-plugin-renamer/claude-md"><img src="https://agentmods.dev/badge/instructions/wyattjoh/herdr-plugin-renamer/claude-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 | $0.03031 | $0.03031 |
| Opus 5 | $0.01515 | $0.01515 |
| Sonnet 5 | $0.00606 | $0.00606 |
| Haiku 4.5 | $0.00303 | $0.00303 |
Grade A, and why
herdr-plugin-renamer CLAUDE.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 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.
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 — 213 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
herdr plugin (Rust) that names a herdr pane from the coding agent's first prompt. When the pane is in an auto-generated linked worktree, it also renames the worktree branch and workspace. The naming engine is swappable: on-device Apple FoundationModels by default (a small Swift helper), with a headless Codex call as the automatic fallback.
Architecture
Single binary, two phases (src/main.rs):
- Hot phase (default, every
pane.agent_status_changedevent): pure env-var reads, no I/O.context::evaluatebails unless the new status isworkingand this pane does not already have a done marker. On a pass, writes a pane-scoped claim marker and forks the cold phase detached (setsid). - Cold phase (
HERDR_NAMING_PHASE=cold):herdr::poll_agent_session→transcript::read_first_prompt→main::generate_slug(walks theengine::engine_chain; fallbackslug::fallback_from_prompt) →herdr::pane_rename. The generated slug is also reported as thetaskmetadata token on the pane and workspace for custom Agent and Space sidebar rows. If the pane is in a linked worktree whose current branch starts withworktree/,git::rename_current_branchrenames it to<prefix>/<slug>and only thenherdr::workspace_renamerenames the workspace to<slug>.
Naming outputs: pane <slug>; branch <prefix>/<slug> (bare <slug> when no prefix is configured;
main::compose_branch joins them); workspace <slug> after a successful
worktree branch rename. The prefix comes from main::resolve_branch_prefix:
HERDR_NAMING_BRANCH_PREFIX env, then a branch-prefix file in
HERDR_PLUGIN_CONFIG_DIR, else none.
Foundation-generated slugs should be compact noun-topic labels, not literal
sentence summaries. Prefer labels such as current-file over
change-selected-file-to-current. The helper must ground labels in the actual
prompt and avoid introducing absent concepts from examples or instructions.
The default Foundation path is two-pass: generate several candidates, sanitize
and dedupe them, then ask FoundationModels to select exactly one candidate from
the cleaned list. Codex remains a fallback only when Foundation fails.
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 · 213 lines · 3,031 tokens per session scan A 92aaf7866225
herdr-plugin-renamer CLAUDE.md is an instructions file published in the GitHub repository wyattjoh/herdr-plugin-renamer (13 stars, last pushed 23d ago), licensed MIT. It adds 3,031 tokens to every session, about $0.0152 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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