What is tandem-browser CLAUDE.md?

A set of repository instructions for coding agents working on the Tandem Browser project. It points agents to the project's development guide, architecture notes, verification command, and manager registry.

Use it when working on the Tandem Browser codebase to find the required documentation, run the verification check, and understand its manager system.

It helps an agent follow the repository's workflow, testing requirements, structure, and rules before changing code.

How hydro13/tandem-browser configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to hydro13/tandem-browser. 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/hydro13/tandem-browser/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/hydro13/tandem-browser

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/hydro13/tandem-browser/claude-md/github.svg)](https://agentmods.dev/instructions/hydro13/tandem-browser/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/hydro13/tandem-browser/claude-md"><img src="https://agentmods.dev/badge/instructions/hydro13/tandem-browser/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/hydro13/tandem-browser/claude-md"><img src="https://agentmods.dev/badge/instructions/hydro13/tandem-browser/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 139 This file is loaded in full into every session.

When invoked 139 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	$0.00139	$0.00139
Opus 5.5	$0.00056	$0.00056
Sonnet 5.5	$0.00028	$0.00028
Haiku 4.5	$0.00014	$0.00014

Measured 2mo ago against content hash fe77324d7aa4, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

tandem-browser 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 · 16 lines

What it actually says

CLAUDE.md

Read AGENTS.md in full — it is the development guide for coding agents working on this repository: workflow, testing gates, git discipline, context discipline, and the anti-detection architecture rules that must never be violated.

Before changing code, also read ARCHITECTURE.md for the layer model and the manager system.

Quick facts:

Verify gate (same as CI): npm run verify
Managers: see src/registry.ts (the source of truth, not doc counts)
All repository content is English; replies to Robin may be Dutch

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 · 16 lines · 139 tokens per session scan A fe77324d7aa4

Subscribe to this mod's changes

tandem-browser CLAUDE.md is an instructions file published in the GitHub repository hydro13/tandem-browser (627 stars, last pushed 4d ago), licensed MIT. It adds 139 tokens to every session, about $0.0006 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.

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tandem-browser CLAUDE.md next to 6 instructions from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
tandem-browser CLAUDE.mdhydro13/tandem-browser	Instructions file	627	4d ago	MIT	A	139	Claude Code
vscode buildNext.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	9,719	GitHub Copilot
next.js AGENTS.mdvercel/next.js	Instructions file	143k	yesterday	MIT	A	7,461	Codex, OpenCode
langchain AGENTS.mdlangchain-ai/langchain	Instructions file	149k	yesterday	MIT	A	4,680	Codex, OpenCode
vscode oss-third-party-notices.instructions.mdmicrosoft/vscode	Instructions file	195k	yesterday	MIT	A	5,516	GitHub Copilot
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

tandem-browser: Instructions file for Claude Code