Aegis is a method pack that guides coding agents to inspect a project's baseline, make bounded changes, and verify their work with fresh evidence. It is for people using coding-agent hosts who want fewer unverified changes and less unnecessary process. The catalogue add-ons implement this method through skills, instructions, commands, a hook, and a plugin.
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.
git clone --depth 1 https://github.com/GanyuanRan/Aegisnpx agentmods add skills/ganyuanran/aegis/update-aegisWrote 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/ganyuanran/aegis/update-aegis)<a href="https://agentmods.dev/skills/ganyuanran/aegis/update-aegis"><img src="https://agentmods.dev/badge/skills/ganyuanran/aegis/update-aegis/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/ganyuanran/aegis/update-aegis"><img src="https://agentmods.dev/badge/skills/ganyuanran/aegis/update-aegis.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00049 | $0.01325 |
| Opus 5 | $0.00024 | $0.00662 |
| Sonnet 5 | $0.00010 | $0.00265 |
| Haiku 4.5 | $0.00005 | $0.00133 |
Grade A, and why
update-aegis 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 11d 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 — 175 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Update Aegis
Update the installed Aegis Method Pack for the current AI coding host.
This skill is host maintenance. Do not edit the target project just because the user asked to update Aegis.
Default Semantics
aegis:updateupdates the current host's registered Aegis installation.- Updating every registered host requires an explicit
--allrequest. - If more than one host is registered and the current host cannot be identified, ask one concrete question before updating.
- Do not update a development checkout when the installed method-pack root is a separate path.
- Do not perform background automatic updates. The local registry may record
updateMode, but this skill only performs explicit user-triggered updates.
Evidence First
From the installed method-pack root, inspect the host-scoped registry:
python scripts/aegis-update.py status --json
If the registry is missing, register the current host before updating. Use the host's install guide and actual discovery path rather than guessing.
If ~/.config/aegis/config.toml already declares method_pack_root, prefer
that canonical root when registering additional hosts. Host-specific discovery
paths, copied skill directories, plugin caches, or adapter payloads should be
treated as generated / host-managed views into the same Aegis body, not as
separate editable checkouts.
Codex example:
python scripts/aegis-update.py register \
--host codex \
--sync-mode junction \
--discovery-root ~/.agents/skills/aegis \
--reload-hint "restart Codex"
Copy-based host example:
python scripts/aegis-update.py register \
--host codebuddy \
--sync-mode copy-skills \
--discovery-root ~/.codebuddy/skills \
--reload-hint "restart CodeBuddy"
Prefixed direct-child host example:
python scripts/aegis-update.py register \
--host copilot \
--sync-mode junction \
--discovery-shape direct-child \
--discovery-root <target-repo>/.github/skills \
--discovery-name-prefix aegis- \
--reload-hint "restart Copilot session or reopen the repository"
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.
- 11d ago First seen · 175 lines · 49 tokens per session scan A da3128e1b0ab
update-aegis is a skill published in the GitHub repository GanyuanRan/Aegis (1,175 stars, last pushed 3d ago), licensed MIT. It adds 49 tokens to every session and 1,325 once invoked, about $0.0002 per session on Opus 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 2026-08-30.
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