agent-aegis

agent-aegis is a skill for Claude Code, Codex from Sistema2D/FrameCode-VibeWork. It costs 13 tokens per session (627 once invoked), scanned A, original, Apache-2.0.

A focused security-review procedure for finding and addressing one small, clear security problem. Security issues include problems such as data exposure, unsafe input, weak access control, or leaked credentials.

In plain words
What is it for?
Use it when reviewing authentication, permissions, endpoints, secrets, path handling, injection, cross-site scripting, server-side request forgery, command execution, or browser-console exposure.
Why use it?
It limits security work to a reviewable change that can be checked and verified. If no safe improvement is found, it records that no change was made.

Skill for Claude CodeCodex

Install

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.

agentmods
npx agentmods add skills/sistema2d/framecode-vibework/agent-aegis
Any agent
npx skills add Sistema2D/FrameCode-VibeWork --skill agent-aegis
Clone the repo
git clone --depth 1 https://github.com/Sistema2D/FrameCode-VibeWork

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 agent-aegis

README.md
[![agentmods](https://agentmods.dev/badge/skills/sistema2d/framecode-vibework/agent-aegis.svg)](https://agentmods.dev/skills/sistema2d/framecode-vibework/agent-aegis)
Your own site
<a href="https://agentmods.dev/skills/sistema2d/framecode-vibework/agent-aegis"><img src="https://agentmods.dev/badge/skills/sistema2d/framecode-vibework/agent-aegis.svg" alt="Measured on agentmods" height="20"></a>
Per session 13 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 627 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
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 $0.00013 $0.00627
Opus 5 $0.00006 $0.00313
Sonnet 5 $0.00003 $0.00125
Haiku 4.5 $0.00001 $0.00063

Measured 5d ago against content hash 212f3bd8df00, method: parsed. Prices are Anthropic first-party input rates as of 2026-09-05, from the pricing page.

Security

Grade A, and why

agent-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 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.

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.

FCVW/skills/agent-aegis/SKILL.md · 73 lines

How it starts

The opening of the file, as written. The whole thing — 73 lines — stays where its author put it; the contents beside it link to each section on GitHub.

SKILL: Agent Aegis

Purpose

Security-focused agent profile for one small, safe, high-value security improvement. It works when loaded by a human, scheduler, automation, or another agent; it does not require a scheduler to be useful.

Activation Triggers

Load when the task involves vulnerability review, hardening, endpoint sanitization, data exposure, authentication, authorization, path traversal, injection, XSS, SSRF, command execution, secret handling, credentials, browser console / DevTools exposure, or the Portuguese equivalents: segurança, vulnerabilidade, vazamento de dados, exposição de dados, credenciais, segredo, autenticação, autorização, permissão, exposição no console, devtools, injeção, or endurecimento.

Mission

Find and address exactly one security issue or hardening opportunity that is clear, small, reviewable, and verifiable. If no safe issue is found, stop and record that no change was made.

Mandatory Governance

  • Follow AGENTS.md, SECURITY.md, PLANNING.md, and TESTS.md.
  • Create or use an active plan before modifying files.
  • Update changelog and validation evidence before closure.
  • For durable codebase-specific security learning, update a canonical page or create a sourced fcvw/wiki@1 page under wiki/agents/ with a collision-resistant ID; do not rely on a shared fixed journal filename.

Boundaries

Stop before implementation if the best fix requires:

  • new dependencies;
  • authentication or authorization redesign;
  • public API breaking change;
  • infrastructure or secret-management change;
  • broad refactoring;
  • real secrets in files, logs, examples, or reports.

Scan Order

  1. Authentication and sessions.
  2. Endpoint and API input boundaries.
  3. Data queries, serialization, and output encoding.
  4. File handling, path traversal, uploads, and command execution.
  5. Logs, errors, secret exposure, and browser console / DevTools data exposure.

Output Required

## Aegis Security Pass

- Skill loaded: `skills/agent-aegis/SKILL.md`
- Issue selected:
- Severity: `critical` / `high` / `medium` / `low` / `hardening`
- Files in scope:
- Fix summary:
- Validation:
- Knowledge update: `yes` / `no`

Read the full file on GitHub · 73 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 First seen · 73 lines · 13 tokens per session scan A 212f3bd8df00

Subscribe to this mod's changes

agent-aegis is a skill published in the GitHub repository Sistema2D/FrameCode-VibeWork (23 stars, last pushed 5d ago), licensed Apache-2.0. It adds 13 tokens to every session and 627 once invoked, about $0.0001 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.