td: Instructions file for Claude Code

CLAUDE.md

td CLAUDE.md is an instructions file for Claude Code from marcus/td. It costs 1,611 tokens per session, scanned C, original, MIT.

A project guide for using Claude, an AI coding assistant, with td, a tool that keeps task information across sessions. It covers starting, recording, handing off, reviewing, approving, building, and releasing work.

In plain words
What is it for?
Use it to manage substantial development tasks with td, pass work between sessions or agents, complete trusted reviews, and follow the project's build and release process.
Why use it?
It reduces lost context between sessions and makes the person or session that reviewed completed work explicit.

Instructions file for Claude Code

Written for Claude Code: the file is CLAUDE.md. Also seen: mentions CLAUDE.md; mentions subagents.

This is marcus/td's own configuration. It tells Claude Code how to work on td itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything td configures →

View source ↗ marcus/td
Reuse

Borrowing it

Nothing to install: this file belongs to marcus/td. 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/marcus/td/main/CLAUDE.md
Clone the repo
git clone --depth 1 https://github.com/marcus/td

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.

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README.md
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Your own site
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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.

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Per session 1,611 This file is loaded in full into every session.
When invoked 1,611 The same file — it is already loaded in full.
Security scan C 1 finding. 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.01611 $0.01611
Opus 5.5 $0.00644 $0.00644
Sonnet 5.5 $0.00322 $0.00322
Haiku 4.5 $0.00161 $0.00161

Measured 2mo ago against content hash a3b2deabdd62, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade C, and why

td CLAUDE.md scanned grade C with 1 finding 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.

Hidden instructionshighPrompt injection

Directives inside HTML comments, invisible characters or bidirectional overrides are read by the model and not by the person reviewing the file.

<!-- td-agent-instructions:start -->
CLAUDE.md · 126 lines

How it starts

The opening of the file, as written. The whole thing — 126 lines — stays where its author put it; the contents beside it link to each section on GitHub.

CLAUDE.md

Working with td

td keeps task context durable across sessions. In a new context, run td usage --new-session -q to see current work.

Use your judgment about how much tracking a task needs. For substantive work: td start <id>, record progress with td log, hand off with td handoff <id>, then td review <id>.

Closing needs a review. Say who did it (default trusted mode; delegated/strict allow only the first):

  • independent session: td approve <id> --reason "..."
  • a sub-agent: td approve <id> --reviewed-by "<who>"
  • you: td approve <id> --self-review --reason "..."

Prefer a reviewer with its own TD_CONTEXT_ID; never name one who did not review.

Run td usage or td <command> --help.

Review Model (Trusted Review)

Work still needs a review before it closes. What changed is that td now asks you to say who reviewed it, rather than assuming the reviewing agent and the recording session are the same thing.

In the default trusted mode:

  • An independent session reviews and closes: td approve <id> --reason "..."
  • A reviewer attests without closing and anyone closes after: td approve <id> --record-only --reason "...", then td approve <id> --reason "..."
  • You implemented it and a sub-agent reviewed it: td approve <id> --reviewed-by "<who>"
  • You implemented it and reviewed it yourself: td approve <id> --self-review --reason "..."

Prefer the first two. When a reviewing sub-agent has its own TD_CONTEXT_ID its independence is mechanically verified rather than asserted — see docs/multi-agent-sessions.md.

--reviewed-by is an attestation td cannot verify. It exists so an orchestrator recording a sub-agent's review writes a true record instead of claiming a self-review it did not perform. Do not use it to launder an unreviewed change: naming a reviewer who did not review is worse than --self-review, because it reads as independent in the audit trail. Do not create a throwaway session to make a review appear independent either.

Read the full file on GitHub · 126 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.

  1. 2mo ago First seen · 126 lines · 1,611 tokens per session scan C a3b2deabdd62

Subscribe to this mod's changes

td CLAUDE.md is an instructions file published in the GitHub repository marcus/td (255 stars, last pushed 10d ago), licensed MIT. It adds 1,611 tokens to every session, about $0.0064 per session on Opus 5.5. A static security scan graded it C with 1 finding (hidden instructions). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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