What is herdr-plugin-renamer CLAUDE.md?

Instructions for a Rust plugin that automatically names an agent pane and, in some linked worktrees, its branch and workspace based on the first prompt.

Configuring the plugin’s architecture, naming engines, module structure, and conventions.

It keeps agent panes and related Git workspaces easier to identify, while allowing different naming engines and fallback names.

How wenhanweime/herdr-plugin-renamer configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to wenhanweime/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.

Copy the file

curl -O https://raw.githubusercontent.com/wenhanweime/herdr-plugin-renamer/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/wenhanweime/herdr-plugin-renamer

Made for: Claude Code.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/instructions/wenhanweime/herdr-plugin-renamer/claude-md/github.svg)](https://agentmods.dev/instructions/wenhanweime/herdr-plugin-renamer/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/wenhanweime/herdr-plugin-renamer/claude-md"><img src="https://agentmods.dev/badge/instructions/wenhanweime/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.

Your own site · 80×15

<a href="https://agentmods.dev/instructions/wenhanweime/herdr-plugin-renamer/claude-md"><img src="https://agentmods.dev/badge/instructions/wenhanweime/herdr-plugin-renamer/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 3,319 This file is loaded in full into every session.

When invoked 3,319 The same file — it is already loaded in full.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

Origin original No closer match found in the catalogue.

Token cost

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	$0.03319	$0.03319
Opus 5.5	$0.01328	$0.01328
Sonnet 5.5	$0.00664	$0.00664
Haiku 4.5	$0.00332	$0.00332

Measured 2mo ago against content hash 026bc60029b3, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

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 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.

CLAUDE.md · 224 lines

How it starts

The opening of the file, as written. The whole thing — 224 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. The default chain uses headless Pi first and then free OpenCode models; Apple FoundationModels, Codex, and Claude remain explicit engine selections.

Architecture

Single binary, two phases (src/main.rs):

Hot phase (default, every pane.agent_status_changed event): pure env-var reads, no I/O. context::evaluate bails unless the new status is working and 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_name (walks the engine::engine_chain; fallbacks slug::display_fallback for labels and slug::fallback_from_prompt for branch slugs) → renames configured targets. The generated name is also reported as the task metadata token on the pane and workspace for custom Agent and Space sidebar rows. With the default tab target on a non-linked workspace, the title is written to workspace (herdr 0.7.4's only bright Agent-sidebar token) and the tab gets the cwd folder basename (dim). Linked worktrees skip that title-on-workspace step so the later branch-slug rename can own the label. Multi-tab siblings share one workspace label (last writer wins). If the pane is in a linked worktree whose current branch starts with worktree/, git::rename_current_branch renames it to <prefix>/<slug> and only then herdr::workspace_rename renames the workspace to <slug>.

Naming outputs: title on workspace (non-worktree); folder on tab; optional pane/agent renames via targets; $task metadata always. Branch <prefix>/<slug> (bare <slug> when no prefix); 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.

Read the full file on GitHub · 224 lines

Changes

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 · 224 lines · 3,319 tokens per session scan A 026bc60029b3

Subscribe to this mod's changes

herdr-plugin-renamer CLAUDE.md is an instructions file published in the GitHub repository wenhanweime/herdr-plugin-renamer (25 stars, last pushed 2mo ago), licensed MIT. It adds 3,319 tokens to every session, about $0.0133 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 2026-08-30.

herdr-plugin-renamer CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
herdr-plugin-renamer CLAUDE.mdwenhanweime/herdr-plugin-renamer	Instructions file	25	2mo ago	MIT	A	3,319	Claude Code
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vscode copilot-instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	3,093	GitHub Copilot
deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness	Instructions file	274k	2d ago	MIT	A	4,313	Codex, OpenCode

herdr-plugin-renamer: Instructions file for Claude Code