Borrowing it
Nothing to install: this file belongs to zhpeng24/devkit. 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/zhpeng24/devkit/main/AGENTS.mdgit clone --depth 1 https://github.com/zhpeng24/devkitWrote 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/zhpeng24/devkit/agents-md)<a href="https://agentmods.dev/instructions/zhpeng24/devkit/agents-md"><img src="https://agentmods.dev/badge/instructions/zhpeng24/devkit/agents-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/zhpeng24/devkit/agents-md"><img src="https://agentmods.dev/badge/instructions/zhpeng24/devkit/agents-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 | $0.00362 | $0.00362 |
| Opus 5.5 | $0.00145 | $0.00145 |
| Sonnet 5.5 | $0.00072 | $0.00072 |
| Haiku 4.5 | $0.00036 | $0.00036 |
Grade A, and why
devkit AGENTS.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 1mo 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.
What it actually says
Devkit
Development constitution
- SIES is the default engineering sequence: Goal → Explore → Prototype → Evaluate → Refine → Engineer → Regress → Learn.
- Scale or merge SIES phases for small deterministic work; do not replace the sequence with a different ceremony for each complexity level.
- Measure progress by goal alignment and closed uncertainty, not by test count, coverage theater, review count, or completed workflow steps.
- Testing is evidence for user goals, stable contracts, and real risks. TDD is an optional Engineering strategy, not the default lifecycle for every code change.
- A passing test suite does not prove success when the Goal Contract or user scenario is unmet.
- Every persistent test must protect an observable success signal, stable contract, or real failure mode and fail when that behavior breaks.
- During Explore and Prototype, run only checks that answer the current decision. Do not prematurely turn disposable probes into regression tests.
- Finish a coherent feature or repair batch before target regression; run the broader project regression once before delivery.
- Do not rerun an unchanged suite when relevant code, configuration, dependencies, fixtures, environment, and evidence have not changed.
- Move tests earlier for justified risk such as bug reproduction, security, migration, concurrency, public API compatibility, or cross-platform behavior.
- GitHub stores goals, evidence, decisions, and delivery links; it is not a fixed linear workflow engine.
- Batch documentation, skill, and metadata edits before validation. Do not start a full regression or independent review for every edited file.
- Promote a process learning only when repeated evidence, a high-impact event, a substantially better method, or explicit user direction justifies it.
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.
- 1mo ago First seen · 32 lines · 362 tokens per session scan A 6db45027b140
devkit AGENTS.md is an instructions file published in the GitHub repository zhpeng24/devkit (2 stars, last pushed 2mo ago), licensed MIT. It adds 362 tokens to every session, about $0.0014 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.
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