What is headless-agentic-codebase CLAUDE.md?

Repository instructions for a project whose coding agent has broad authority to build, refactor, and ship tested changes. They define architecture rules, coding standards, testing expectations, logging, secrets, commit formats, and unattended operation.

Use them during development of this project to implement issues, propose features, update architecture decisions, write tests, follow strict typing and formatting, and work safely without supervision.

They tell an agent how to make changes that fit the project's design and quality checks, including what to do when it disagrees with an architecture decision.

How nkhdiscovery/headless-agentic-codebase configures Claude Code

Reuse

Borrowing it

Nothing to install: this file belongs to nkhdiscovery/headless-agentic-codebase. 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/nkhdiscovery/headless-agentic-codebase/main/CLAUDE.md

Clone the repo

git clone --depth 1 https://github.com/nkhdiscovery/headless-agentic-codebase

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/nkhdiscovery/headless-agentic-codebase/claude-md/github.svg)](https://agentmods.dev/instructions/nkhdiscovery/headless-agentic-codebase/claude-md)

Your own site

<a href="https://agentmods.dev/instructions/nkhdiscovery/headless-agentic-codebase/claude-md"><img src="https://agentmods.dev/badge/instructions/nkhdiscovery/headless-agentic-codebase/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/nkhdiscovery/headless-agentic-codebase/claude-md"><img src="https://agentmods.dev/badge/instructions/nkhdiscovery/headless-agentic-codebase/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 712 This file is loaded in full into every session.

When invoked 712 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. ✓ AI security review Sonnet 5 · 7 Sept 2026 📄 Read the review

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	$0.00712	$0.00712
Opus 5.5	$0.00285	$0.00285
Sonnet 5.5	$0.00142	$0.00142
Haiku 4.5	$0.00071	$0.00071

Measured 2mo ago against content hash 00c04e63b02f, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

headless-agentic-codebase 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 · 69 lines

How it starts

The opening of the file, as written. The whole thing — 69 lines — stays where its author put it; the contents beside it link to each section on GitHub.

{{PROJECT_NAME}} — Agent Instructions

You are a founding engineer and product thinker on {{PROJECT_NAME}}. Read this file every session. Consult docs/ for details.

What {{PROJECT_NAME}} is

Your authority

You have full authority to design, build, and ship. Specifically:

Implement queued issues
Propose and build new features you think make {{PROJECT_NAME}} better
Refactor anything you think is wrong
Challenge ADRs — write a superseding ADR, then implement
Add dependencies when justified
Evolve product scope — {{PROJECT_NAME}} can grow beyond the initial brief

The only constraint: ship working, tested code. Everything else is judgment.

Architecture invariants (challenge via ADR, not silently)

Coding conventions

Language version pinned, type-checked strictly
Formatter + linter enforced in CI
Tests required for every module — fakes/mocks for external systems
No print()/console.log() in library code — use proper logging
No secrets in code — .env (gitignored), vars in .env.example
Conventional commits: feat:, fix:, refactor:, test:, docs:, chore:

Unattended mode

Check for .claude/unattended at the start of every session. If present, read docs/unattended-rules.md and follow it. You have full autonomy: self-merge after CI green, propose and build new features, challenge architecture.

If marker absent: interactive mode, human is present, ask when unsure.

What lives where

CLAUDE.md — this file, always loaded
STATUS.md — non-technical project status; feature table + current focus. Refreshed by 12h cron via status-update issues.
docs/product.md — product vision, market, open decisions
docs/architecture.md — technical architecture
docs/phases.md — build phases / roadmap (visual Gantt + per-phase user-testable states)
docs/decisions/ — ADRs (numbered; supersede don't delete)
docs/audits/ — self-audit outputs
logs/progress.md — plain-English log of what's been built
logs/daily/ — daily session logs
src/ (or {{PROJECT_NAME}}/) — source code
tests/ — tests + fakes for external systems
plans/ — per-deliverable plans (ephemeral)

Read the full file on GitHub · 69 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 · 69 lines · 712 tokens per session scan E 00c04e63b02f

Subscribe to this mod's changes

headless-agentic-codebase CLAUDE.md is an instructions file published in the GitHub repository nkhdiscovery/headless-agentic-codebase (10 stars, last pushed 6mo ago), licensed MIT. It adds 712 tokens to every session, about $0.0028 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 2026-08-31.

agentic-ai agentic-coding ai-agent ai-engineering autonomous-agent boilerplate

headless-agentic-codebase CLAUDE.md next to 6 instructions from other repositories
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headless-agentic-codebase CLAUDE.mdnkhdiscovery/headless-agentic-codebase	Instructions file	10	6mo ago	MIT	A	712	Claude Code
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headless-agentic-codebase: Instructions file for Claude Code