Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add Phelan164/codex-howto --skill choose-engineering-flowgit clone --depth 1 https://github.com/Phelan164/codex-howtoWrote 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/skills/phelan164/codex-howto/choose-engineering-flow)<a href="https://agentmods.dev/skills/phelan164/codex-howto/choose-engineering-flow"><img src="https://agentmods.dev/badge/skills/phelan164/codex-howto/choose-engineering-flow/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/skills/phelan164/codex-howto/choose-engineering-flow"><img src="https://agentmods.dev/badge/skills/phelan164/codex-howto/choose-engineering-flow.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 | $0.00058 | $0.00468 |
| Opus 5 | $0.00029 | $0.00234 |
| Sonnet 5 | $0.00012 | $0.00094 |
| Haiku 4.5 | $0.00006 | $0.00047 |
Grade A, and why
choose-engineering-flow 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 8d 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
Choose Engineering Flow
Use this explicit-only skill as an educational example of workflow routing. It is not part of the recommended installable catalog; prefer clear specialist descriptions and direct activation in normal work.
Recommend one entry skill and only the supporting skills that materially change the work. Do not perform the requested engineering task.
Route the request
- Identify the requested outcome: implement, test, review, secure, operate, or coordinate.
- Prefer one entry skill:
- use
$engineering-loopfor an end-to-end feature or defect; - use
$test-softwarefor test-only work; - use
$review-codefor review-only work; - use
$review-securityfor security-only analysis; - use
$orchestrate-engineeringonly for complex work with genuinely independent workstreams.
- use
- Add at most the relevant domain specialist:
$build-frontendfor rendered UI, client behavior, or accessibility;$build-backendfor APIs, services, persistence, jobs, or integrations;$operate-devopsfor infrastructure, CI/CD, deployment, or operations.
- Do not recommend a specialist already covered by the chosen entry skill unless its domain decisions are material.
- Ask one concise question only when the answer would change the entry skill.
Return the recommendation
Use this format:
Start with: $skill-name
Add only if needed: $other-skill
Why: one sentence tied to the task
Suggested invocation: $skill-name <bounded request and done condition>
Omit Add only if needed when one skill is sufficient. Never recommend loading
the entire catalog by default.
Acceptance criteria
- The recommendation uses existing skills rather than inventing a new workflow.
- One skill owns the task lifecycle.
- Supporting skills have a task-specific reason.
- The output is shorter than the task description it routes.
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 8d ago First seen · 54 lines · 58 tokens per session scan A e50e775bb976
choose-engineering-flow is a skill published in the GitHub repository Phelan164/codex-howto (3 stars, last pushed 3d ago), licensed MIT. It adds 58 tokens to every session and 468 once invoked, about $0.0003 per session on Opus 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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