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 lsantosweb/codex-agents-skills-kit --skill code-archaeologistgit clone --depth 1 https://github.com/lsantosweb/codex-agents-skills-kitWrote 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/lsantosweb/codex-agents-skills-kit/code-archaeologist)<a href="https://agentmods.dev/skills/lsantosweb/codex-agents-skills-kit/code-archaeologist"><img src="https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/code-archaeologist/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/lsantosweb/codex-agents-skills-kit/code-archaeologist"><img src="https://agentmods.dev/badge/skills/lsantosweb/codex-agents-skills-kit/code-archaeologist.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 | $0.00027 | $0.00270 |
| Opus 5.5 | $0.00011 | $0.00108 |
| Sonnet 5.5 | $0.00005 | $0.00054 |
| Haiku 4.5 | $0.00003 | $0.00027 |
Grade A, and why
code-archaeologist 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 2mo 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
When to use
Use this skill when the request mentions:
- legacy code
- refactor
- spaghetti code
- explain this repo
- understand current behavior before changing it
- undocumented system
Core operating rules
- Do not remove or rewrite behavior before understanding why it exists.
- Prefer wrapping and strangler-pattern migration over rewrite-first behavior.
- Before changing functional behavior, establish characterization tests when feasible.
- Document risk, coupling, and likely side effects.
Investigation workflow
- Identify entry points and major modules.
- Trace data flow and mutation points.
- Detect global mutable state, circular imports, and hidden coupling.
- Describe current behavior in plain language.
- Recommend the smallest safe refactor path.
Preferred report structure
- Artifact analyzed
- Estimated age/style clues
- Inputs and outputs
- Dependencies and side effects
- Risk factors
- Safe refactoring plan
- Tests to add before deeper edits
Mandatory constraints
- No large rewrite without tests or a fallback plan.
- Prefer extracting methods, renaming symbols, and adding guard clauses before architectural rewrites.
- Explicitly mark unknowns and assumptions.
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.
- 2mo ago First seen · 46 lines · 27 tokens per session scan A f6bab43f858d
code-archaeologist is a skill published in the GitHub repository lsantosweb/codex-agents-skills-kit (2 stars, last pushed 7mo ago), licensed MIT. It adds 27 tokens to every session and 270 once invoked, about $0.0001 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 2026-08-31.
code-archaeologist compared with skills from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| code-archaeologistlsantosweb/codex-agents-skills-kit | Skill | 2 | 7mo ago | MIT | A | 27 | Codex |
| systematic-debuggingopen-metadata/OpenMetadata | Skill | 16k | yesterday | Apache-2.0 | A | 37 | Claude Code |
| log-error-digestzebbern/claude-code-guide | Skill | 4.7k | 3d ago | MIT | A | 71 | Claude Code, Codex |
| cwv-optimizeradobe/skills | Skill | 319 | yesterday | Apache-2.0 | A | 112 | Claude Code |
| ci-fixersipyourdrink-ltd/bernstein | Skill | 1.2k | yesterday | Apache-2.0 | A | 15 | Claude Code, Codex |
| incident-response-incident-responsermyndharis/antigravity-skills | Skill | 1.9k | 23d ago | MIT | A | 36 | Claude Code |
| triaging-web-analytics-supportPostHog/posthog | Skill | 41k | yesterday | none | A | 151 | Claude Code, Codex |