aeon-doctor

aeon-doctor is a skill for Claude Code, Codex from aeonfun/aeon. It costs 59 tokens per session (3,719 once invoked), scanned B, original, MIT.

A read-only checker for configuration files and skill definitions in an Aeon instance. Configuration is the set of settings that determines what runs and how it runs.

In plain words
What is it for?
Use it to inspect the whole instance or one skill for configuration errors. It reports precise problems for an operator or repair process to fix, but does not change the files.
Why use it?
It catches setup mistakes that may prevent a skill from running at all, including invalid schedules, duplicate settings, typos, and broken references.

Skill for Claude CodeCodex

Written for no agent in particular: nothing here depends on one. Also seen: mentions CLAUDE.md.

Needs its repository: it runs a file that does not travel with it, so clone the repository first. The line is node scripts/validate-config.js # authoritative — dup keys, misspelled entry keys, checkout ordering.

Good fit Use it to inspect the whole instance or one skill for configuration errors. It reports precise problems for an operator or repair process to fix, but does not change the files.

Compare 6 skills from other repositories ↓
Install

Getting it into your agent

It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.

Clone the repo
git clone --depth 1 https://github.com/aeonfun/aeon
agentmods
npx agentmods add skills/aeonfun/aeon/aeon-doctor

Made for: Claude Code, 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.

agentmods badge for aeon-doctor

README.md
[![agentmods](https://agentmods.dev/badge/skills/aeonfun/aeon/aeon-doctor/github.svg)](https://agentmods.dev/skills/aeonfun/aeon/aeon-doctor)
Your own site
<a href="https://agentmods.dev/skills/aeonfun/aeon/aeon-doctor"><img src="https://agentmods.dev/badge/skills/aeonfun/aeon/aeon-doctor/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.

agentmods 80×15 button for aeon-doctor

Your own site · 80×15
<a href="https://agentmods.dev/skills/aeonfun/aeon/aeon-doctor"><img src="https://agentmods.dev/badge/skills/aeonfun/aeon/aeon-doctor.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 59 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 3,719 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: 2 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 81
    Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.
    Fix: Remove all code or instructions that read MCP configuration files (mcp.json). MCP server details should be managed by the agent runtime, not read by individual skills.
  • high Agent Snooping · line 83
    Skill accesses MCP server configuration files (mcp.json). MCP configs contain server URLs, authentication tokens, and tool definitions — reading them allows the skill to discover and potentially abuse other tool integrations.
    Fix: Remove all code or instructions that read MCP configuration files (mcp.json). MCP server details should be managed by the agent runtime, not read by individual skills.
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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00059 $0.03719
Opus 5.5 $0.00024 $0.01488
Sonnet 5.5 $0.00012 $0.00744
Haiku 4.5 $0.00006 $0.00372

Measured 5d ago against content hash 4d6a31d5f739, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade B, and why

aeon-doctor 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 5d 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.

Reads MCP configurationmediumAgent snooping

mcp.json carries server URLs and auth tokens; reading it lets a mod discover and abuse other integrations.

grep -oE '\$\{[A-Z0-9_]+\}' .mcp.json | sort -u # no .mcp.json = no output
Origin

Copies of this mod

1 near-identical copy found in the catalogue:

skills/aeon-doctor/SKILL.md · 137 lines

How it starts

The opening of the file, as written. The whole thing — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.

${var} — scope. Empty (default) = lint the entire instance config (aeon.yml + every skills/*/SKILL.md + .mcp.json). A skill slug (e.g. digest) = lint just that one skill's aeon.yml entry and its SKILL.md.

Today is ${today}. You are this instance's config doctor. Every other health skill (heartbeat, skill-health) reads run outcomes — did a skill fire, did it pass. You read the config itself, before anything runs, for the class of bug where a skill is silently misconfigured and never fires at all — no error, no failed run, nothing in the Actions tab to notice. That class is invisible to run-based observability by construction, and it is the single most common reason an Aeon instance quietly stops doing what its operator thinks it does.

You do not fix anything — a diagnostic that inspects config must never mutate it. You surface precise, actionable findings; the operator (or skill-repair) applies the fix.

Preamble (always)

  1. Read memory/MEMORY.md for context and scan the last ~3 days of memory/logs/ — drop any finding you already reported so you don't re-nag a known-but-unfixed issue every run. (A finding is "the same" if it's the same check on the same skill.)
  2. Resolve scope from ${var}: empty → all skills; a slug → restrict every check to that skill (skip fleet-wide-only checks like duplicate-key detection unless they touch the target).
  3. Every check below is a pure local file read - grep, sort, and node (inline or node scripts/*.js). This skill is read-only, whose tool allowlist (scripts/skill_mode.sh) has grep/sort/head/tail/wc/cat/jq/node but not awk/sed/comm/bash, so the checks use those. No network, no secrets, no GitHub API. If a referenced script is missing, skip that check and note it; never let one check's failure stop the others.

Steps — run every check, collect findings

Each finding = {check, skill, severity, one-line what's-wrong, exact fix}. Severity:

  • critical — an enabled: true skill that will never fire or will run with the wrong privilege. Live breakage.
  • warn — a latent trap: the same defect on a disabled skill, or a correctness issue that degrades silently rather than killing the run.

Read the full file on GitHub · 137 lines

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.

  1. 5d ago Changed 4d6a31d5f739
  2. 23d ago Changed ab06717cc439
  3. 24d ago Changed · -15 lines 9bcc15095d44
  4. 1mo ago First seen · 152 lines · 59 tokens per session scan B b801bcf20983

Subscribe to this mod's changes

aeon-doctor is a skill published in the GitHub repository aeonfun/aeon (782 stars, last pushed today), licensed MIT. It adds 59 tokens to every session and 3,719 once invoked, about $0.0002 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads mcp configuration). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.