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 jscraik/Agent-Skills --skill codex-agent-creatorgit clone --depth 1 https://github.com/jscraik/Agent-SkillsWrote 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/jscraik/agent-skills/codex-agent-creator)<a href="https://agentmods.dev/skills/jscraik/agent-skills/codex-agent-creator"><img src="https://agentmods.dev/badge/skills/jscraik/agent-skills/codex-agent-creator/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/jscraik/agent-skills/codex-agent-creator"><img src="https://agentmods.dev/badge/skills/jscraik/agent-skills/codex-agent-creator.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 | $0.00070 | $0.01708 |
| Opus 5.5 | $0.00028 | $0.00683 |
| Sonnet 5.5 | $0.00014 | $0.00342 |
| Haiku 4.5 | $0.00007 | $0.00171 |
Grade A, and why
codex-agent-creator 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.
How it starts
The opening of the file, as written. The whole thing — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill: Codex Agent Creator
Purpose
Create, review, install, fold, or validate Codex custom subagent role files, routing manifests, task envelopes, and discoverability wiring. Prefer one valid role, explicit scope, runtime-state evidence, validation proof, and rollback over broad edits or duplicate agents.
Philosophy
Build the smallest role surface that can be validated from current Codex evidence.
When to Use
- The user asks for a Codex custom subagent, reviewer/delegation role, role TOML, or role validation.
- The work targets standalone role TOML,
[agents.<name>],.codex/agents/*.toml, or duplicate role folding. - The user wants a bounded swarm or delegation plan that depends on Codex roles.
- The user wants role routing, agent task envelopes, artifact-first reviewer output, blocked-agent classification, or agent boundary validation.
When Not to Use
- The artifact should be a skill, hook, CI gate, MCP tool,
AGENTS.mdrule, or approval workflow. - The target is a projection, generated handle, cache, or mirror and a canonical source exists.
- The user has not authorized global, user-scope, project-config, external, destructive, or ambiguous writes.
Inputs
- Edit canonical sources only; do not hand-edit
.agents/**,.skillsets/**,Plugins/cache/**, mirrors, or handles. - For
agent-skills, readAGENTS.mdandUBIQUITOUS_LANGUAGE.mdbefore edits. - Ground Codex config keys from official docs,
codex-repo, or local~/dev/codexsource before writing. Current source anchors includecodex-rs/config/src/config_toml.rs,codex-rs/core/src/config/agent_roles.rs, andcodex-rs/core/src/tools/handlers/multi_agents_spec.rs. - Confirm install scope before writing config; validation-only work writes no install config.
- Prefer live runtime-state snapshots over chat memory when judging branch, head, dirty state, active agents, expected artifacts, or validation freshness.
- Narrow each role request to one primary surface before editing:
standalone role file, declaring
[agents.<name>]table, routing manifest, task envelope, or artifact receipt contract. Keep scope tight by default; add a second surface only when it is required for discoverability or validation.
What ships with it
7 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.
- 1mo ago First seen · 139 lines · 70 tokens per session scan A f84f3ffe920d
codex-agent-creator is a skill published in the GitHub repository jscraik/Agent-Skills (9 stars, last pushed yesterday), licensed Apache-2.0. It adds 70 tokens to every session and 1,708 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 2026-09-03.
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