Borrowing it
Nothing to install: this file belongs to phase-rs/phase. 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/phase-rs/phase/main/.claude/agents/engine-implementation-executor.mdgit clone --depth 1 https://github.com/phase-rs/phaseWrote 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/agents/phase-rs/phase/engine-implementation-executor)<a href="https://agentmods.dev/agents/phase-rs/phase/engine-implementation-executor"><img src="https://agentmods.dev/badge/agents/phase-rs/phase/engine-implementation-executor/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/agents/phase-rs/phase/engine-implementation-executor"><img src="https://agentmods.dev/badge/agents/phase-rs/phase/engine-implementation-executor.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 | $0.00068 | $0.00194 |
| Opus 5.5 | $0.00027 | $0.00078 |
| Sonnet 5.5 | $0.00014 | $0.00039 |
| Haiku 4.5 | $0.00007 | $0.00019 |
Grade A, and why
engine-implementation-executor 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
Engine Implementation Executor (Claude Code agent type)
Before doing anything else, read .claude/skills/engine-implementer/executor.md in full and follow it. That file is the executor's single authority and is shared with Codex and other runtimes; this file only registers the agent type and its tools for Claude Code. If the file cannot be read, stop and report that as your only output.
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 Changed · -269 lines 00fe0bfa2d3f
- 1mo ago Changed · +2 lines 9a53cc32f0d1
- 1mo ago Changed 0998c74749a0
- 2mo ago First seen · 278 lines · 68 tokens per session scan A 4b97eeeeb1fa
engine-implementation-executor is an agent published in the GitHub repository phase-rs/phase (313 stars, last pushed today), licensed Apache-2.0. It adds 68 tokens to every session and 194 once invoked, about $0.0003 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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