Borrowing it
Nothing to install: this file belongs to yusifeng/formax. 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/yusifeng/formax/main/.codex/skills/formax-system-prompt-workflow/SKILL.mdgit clone --depth 1 https://github.com/yusifeng/formaxWrote 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/yusifeng/formax/formax-system-prompt-workflow)<a href="https://agentmods.dev/skills/yusifeng/formax/formax-system-prompt-workflow"><img src="https://agentmods.dev/badge/skills/yusifeng/formax/formax-system-prompt-workflow/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/yusifeng/formax/formax-system-prompt-workflow"><img src="https://agentmods.dev/badge/skills/yusifeng/formax/formax-system-prompt-workflow.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00890 |
| Opus 5 | $0.00029 | $0.00445 |
| Sonnet 5 | $0.00012 | $0.00178 |
| Haiku 4.5 | $0.00006 | $0.00089 |
Grade A, and why
formax-system-prompt-workflow 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 10d 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.
How it starts
The opening of the file, as written. The whole thing — 76 lines — stays where its author put it; the contents beside it link to each section on GitHub.
formax-system-prompt-workflow
Goal
Use this skill when changing system prompt assembly, reminder injection, deferred tool exposure, or skills prompt presentation.
Read First
docs/contracts/prompt-tool-exposure-contract.mddocs/contracts/skills-contract.mddocs/contracts/semantics-contract.mdwhen request-scoped helper blocks affect replay or transcript semantics
Optional working notes:
references/parity-checklist.mdreferences/parity-evidence-template.md
These docs are canonical. If stable behavior changes, update them before or with code.
Invariants
- Keep a single prompt-profile path.
- do not reintroduce
promptProfile,lite, or similar profile branches
- do not reintroduce
- Treat
FORMAX_DEFERRED_TOOL_EXPOSUREas a linked behavior bundle.- prompt variant, tools exposure style, and skills presentation must stay aligned
- Keep helper blocks request-scoped and ephemeral.
- injected
<system-reminder>blocks and deferred helper blocks must not pollute persisted long-term history
- injected
- Only claim capabilities that Formax runtime actually implements.
- do not add CC-like capability prose before the runtime supports it
Code Map
packages/core/src/prompts/system.ts: system prompt text, variant selection, capability gatespackages/core/src/features/repl/controller/send/sendMainTurn.ts: per-turn injected block order and REPL assemblypackages/core/src/tools/runtime/deferredToolExposureResolver.ts: deferred tools exposure and helper-block contentpackages/core/src/tools/modules/skill/index.ts: skill tool description shaping and skills reminder textpackages/core/src/chat/engine.ts: request assembly and injected-block persistence boundaries- Cross-entrypoint mirrors when semantics move:
packages/core/src/app-server/turnRunner.tspackages/core/src/sdk/query/runner.ts
scripts/repl-request-preview.ts: quick dry-run payload preview without live network calls
Deferred Exposure Checklist (FORMAX_DEFERRED_TOOL_EXPOSURE=1)
What ships with it
3 files 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.
- 10d ago First seen · 76 lines · 58 tokens per session scan A 89e7da8fe2ad
formax-system-prompt-workflow is a skill published in the GitHub repository yusifeng/formax (193 stars, last pushed 1mo ago), licensed MIT. It adds 58 tokens to every session and 890 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 2026-08-30.
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