What is migrate-agents-to-codex?

An agent-migration skill converts Claude agent definition files into Codex-compatible agent files, using Markdown or TOML formats.

Use it to migrate files from .claude/agents/ into .codex/agents/, preserve runtime settings, normalize tool namespaces, extract large reference content, and review the converted agents.

It removes manual conversion work and checks that the result follows Codex's native agent format rather than simply preserving a Claude-specific file.

How zuharz/ccode-to-codex configures Codex

Reuse

Borrowing it

Nothing to install: this file belongs to zuharz/ccode-to-codex. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file

curl -O https://raw.githubusercontent.com/zuharz/ccode-to-codex/main/.codex/skills/migrate-agents-to-codex/SKILL.md

Clone the repo

git clone --depth 1 https://github.com/zuharz/ccode-to-codex

Made for: Codex.

Wrote 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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/zuharz/ccode-to-codex/migrate-agents-to-codex/github.svg)](https://agentmods.dev/skills/zuharz/ccode-to-codex/migrate-agents-to-codex)

Your own site

<a href="https://agentmods.dev/skills/zuharz/ccode-to-codex/migrate-agents-to-codex"><img src="https://agentmods.dev/badge/skills/zuharz/ccode-to-codex/migrate-agents-to-codex/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/zuharz/ccode-to-codex/migrate-agents-to-codex"><img src="https://agentmods.dev/badge/skills/zuharz/ccode-to-codex/migrate-agents-to-codex.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 120 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 7,984 The whole file, excluding the scripts and references it only reads on demand.

Security scan B 1 finding. A grade says what 26 rules found in the file — not that it is safe. Third-party audits

NVIDIA SkillSpector warn 7 Sept 2026

SkillSpector: 11 findings, up to high

These are SkillSpector’s own severities. On a checked sample its high-severity flags on skills were ~96% false positives — a documented command, a public API, a “never do X” rule — so we show them as a caution to read, not a verdict. Why →

high Agent Snooping · line 194
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
high Agent Snooping · line 386
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
high Agent Snooping · line 398
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
high Agent Snooping · line 407
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
high Agent Snooping · line 415
Skill reads from agent configuration directories (.claude/, .codex/, .gemini/). These directories may contain API keys, personal settings, and other credentials that the skill has no legitimate need to access.

Fix: Remove all code or instructions that access agent configuration directories (.claude/, .codex/, .gemini/). If configuration values are needed, pass them explicitly as parameters or environment variabl
medium Agent Snooping · line 197
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
medium Agent Snooping · line 755
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
medium Agent Snooping · line 205
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
medium Agent Snooping · line 206
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
medium Agent Snooping · line 207
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.
medium Agent Snooping · line 431
Skill enumerates or reads other installed skills. Access to other skills' SKILL.md files or the skills directory reveals prompt instructions, capabilities, and secrets that should be invisible to peer skills.

Fix: Remove all code or instructions that list or read other skills' files or directories. Skills should operate independently; cross-skill access is a privilege escalation.

How audits are shown

Origin original No closer match found in the catalogue.

Token cost

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	$0.00120	$0.07984
Opus 5	$0.00060	$0.03992
Sonnet 5	$0.00024	$0.01597
Haiku 4.5	$0.00012	$0.00798

Measured 9d ago against content hash 39d8e86fd8f1, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-08, from the pricing page.

Security

Grade B, and why

migrate-agents-to-codex scanned grade B with 1 finding 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 9d ago.

The scan reads SKILL.md. This mod also ships 3 executable files (scripts/migrate_claude_agents_to_codex.py, scripts/run_agent_migration_workflow.py, tests/test_migrate_claude_agents_to_codex.py), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Enumerates other installed skillsmediumAgent snooping

Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.

ls .codex/skills/

.codex/skills/migrate-agents-to-codex/SKILL.md · 775 lines

How it starts

The opening of the file, as written. The whole thing — 775 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Migrate Agents to Codex

Purpose

Migrates Claude agent definitions from .claude/agents/*.md (YAML frontmatter

markdown body) to Codex-compatible outputs under .codex/agents/.

Preferred output: standalone TOML custom-agent files. Backward-compatible output only: pure-markdown behavioral specifications.

The migration strips frontmatter, maps fields to native Codex contracts, preserves runtime hints such as model, effort, reasoning_effort, and model_reasoning_effort, normalizes MCP namespaces, and extracts large domain content into companion reference files.

After migration, a native Codex compliance audit (GPT-5.4 inline sub-agent) validates every migrated file passes as a native Codex sub-agent — not a ported Claude artifact. Mechanical output is never final on write alone: every mechanically generated agent requires a recorded manual nativeness review before it may be treated as native. Findings are auto-addressed and a convergence check confirms no regressions were introduced by the fixes.

Pipeline position: CODE → VERIFY (runs during implementation phase). Covers 2 stages: CODE (migration) + VERIFY (adversarial review loop).

Canonical conversation wrapper: .codex/skills/migrate-agents-to-codex/scripts/run_agent_migration_workflow.py Deterministic engine: .codex/skills/migrate-agents-to-codex/scripts/migrate_claude_agents_to_codex.py

Conversation-First Entry

Bare requests should start with a user-facing action menu, not a wall of CLI flags. Follow the shared contract in ../migrate-to-codex/references/conversational-migration-contract.md.

Default menu for underspecified requests:

Assess one agent
Preview one agent as TOML
Migrate one agent live
Batch preflight all agents
Review one migrated agent for nativeness
Explain MCP or skill blockers

Routing rules:

If the user already says preview example-agent-e, migrate example-agent-c, or review example-agent-e, route directly.
In Plan mode, use request_user_input only for the action choice.
Outside Plan mode, render the same action set as a numbered text menu.
If the action still needs an agent name, ask for it in plain text.
Require explicit confirmation before any live write into .codex/agents/ or any --force overwrite.

Read the full file on GitHub · 775 lines

Files

What ships with it

11 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.

Changes

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.

9d ago First seen · 775 lines · 120 tokens per session scan B 39d8e86fd8f1

Subscribe to this mod's changes

migrate-agents-to-codex is a skill published in the GitHub repository zuharz/ccode-to-codex (70 stars, last pushed 19d ago), licensed MIT. It adds 120 tokens to every session and 7,984 once invoked, about $0.0006 per session on Opus 5. A static security scan graded it B with 1 finding (enumerates other installed skills). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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