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.
curl -O https://raw.githubusercontent.com/zuharz/ccode-to-codex/main/.codex/skills/verify-skill-migration/SKILL.mdgit clone --depth 1 https://github.com/zuharz/ccode-to-codexWrote 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/zuharz/ccode-to-codex/verify-skill-migration)<a href="https://agentmods.dev/skills/zuharz/ccode-to-codex/verify-skill-migration"><img src="https://agentmods.dev/badge/skills/zuharz/ccode-to-codex/verify-skill-migration.svg" alt="Measured on agentmods" height="20"></a>- NVIDIA SkillSpector warn
SkillSpector: 1 finding, up to medium
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 →
- medium Agent Snooping · line 110 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.
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 | $0.00017 | $0.00968 |
| Opus 5 | $0.00009 | $0.00484 |
| Sonnet 5 | $0.00003 | $0.00194 |
| Haiku 4.5 | $0.00002 | $0.00097 |
Grade B, and why
verify-skill-migration 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 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.
Enumerates other installed skillsmediumAgent snooping
Other skills' SKILL.md files reveal prompts, capabilities and secrets that should be invisible to peers.
--scan-dir .codex/skills/verify-skill-migration How it starts
The opening of the file, as written. The whole thing — 143 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Verify Skill Migration
Use the canonical migration validator after each batch and before finalizing a migrated skill set.
The validator implementation lives at:
.codex/skills/verify-skill-migration/scripts/validate_skill_migration.py
Use the stable repo entrypoint for normal runs:
python3 tools/migration_support/validate_names.py
Checks
structural-integrity
- Fails on MCP callable namespaces that still preserve hyphenated server IDs
frontmatter
- Applies to
SKILL.mdentrypoints only - Parses YAML frontmatter
- Requires
nameanddescription - Fails on prohibited keys:
allowed-tools,effort,metadata
line-count
- Warns when a
SKILL.mdfile reaches 500+ lines - Warning only, not a failure
references
- Validates
references/directories under the scan scope - Fails on empty
references/directories - Fails on empty reference files, including nested files
Cross-References Check
- Warns on unknown skill references
- Uses discovered skill names instead of treating arbitrary backticked words as skills
skill-remnants
- Fails on legacy skill primitive call syntax in Codex artifacts
stale-paths
- Fails on operational legacy migration path references
- Ignores provenance banner lines such as
Source:andGenerated by:
operator-guidance
- Applies to the migration-family skill packages
- Fails on operator-facing repo paths that do not resolve there
- Fails on mistaken filesystem-root repo paths such as
/.codex/... - Fails on legacy slash-skill invocations in migration-family operational guidance
- Resolves skill-local
references/...andscripts/...before repo-root paths
agent-dependencies
- Fails on unresolved named agent runtime dependencies
- Treats only
.codex/agents/*.tomlas authoritative runtime contracts - Does not let legacy
.codex/agents/*.mdreferences satisfy dependency resolution
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 · 143 lines · 17 tokens per session scan B 8489805bdca7
verify-skill-migration is a skill published in the GitHub repository zuharz/ccode-to-codex (70 stars, last pushed 18d ago), licensed MIT. It adds 17 tokens to every session and 968 once invoked, about $0.0001 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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