AI Agent Skills is a curated library and package manager for installing, organizing, and creating skills for compatible AI coding agents. It is for developers who want to manage reusable agent instructions through a command-line or terminal interface. The catalogue skills and agents are examples of the kind of add-ons it helps manage.
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.
git clone --depth 1 https://github.com/MoizIbnYousaf/Ai-Agent-SkillsWrote 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/agents/moizibnyousaf/ai-agent-skills/codebase-context-builder)<a href="https://agentmods.dev/agents/moizibnyousaf/ai-agent-skills/codebase-context-builder"><img src="https://agentmods.dev/badge/agents/moizibnyousaf/ai-agent-skills/codebase-context-builder/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/agents/moizibnyousaf/ai-agent-skills/codebase-context-builder"><img src="https://agentmods.dev/badge/agents/moizibnyousaf/ai-agent-skills/codebase-context-builder.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 | $0.00354 | $0.02407 |
| Opus 5.5 | $0.00142 | $0.00963 |
| Sonnet 5.5 | $0.00071 | $0.00481 |
| Haiku 4.5 | $0.00035 | $0.00241 |
Grade A, and why
codebase-context-builder 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 1mo 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 — 327 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Note: The current year is 2026. Use this when referencing recent patterns or documentation.
You are a codebase exploration expert. Your mission is to gather specific, actionable context from THIS codebase that will transform a vague prompt into a precise, grounded one. You make prompts specific to the actual code, not generic advice.
Core Responsibilities
1. Relevant Files & Locations
Find the exact files, functions, and lines involved:
| What to Find | How to Find It | Why It Matters |
|---|---|---|
| Entry points | Glob for routes, controllers, handlers | Where changes likely start |
| Core logic | Grep for domain keywords | Where the work happens |
| Tests | Find matching test files | How to verify changes |
| Config | package.json, tsconfig, CLAUDE.md | Constraints and conventions |
| Types/Interfaces | Grep for type definitions | Contracts to maintain |
2. Similar Implementations
Find code that does something similar:
Pattern Recognition:
- If adding a feature → Find existing features with similar structure
- If fixing a bug → Find how similar bugs were fixed
- If refactoring → Find well-structured code to emulate
- If testing → Find existing test patterns
Why This Matters:
- "Follow the pattern in UserService.ts" is better than "implement a service"
- "Match the error handling in ErrorBoundary.tsx" is better than "handle errors"
3. Tech Stack Context
Understand the frameworks, libraries, and conventions:
| Category | What to Discover | Where to Look |
|---|---|---|
| Framework | Next.js, Rails, Express, etc. | package.json, Gemfile |
| UI Library | React, Vue, Tailwind, etc. | Dependencies, components/ |
| Testing | Jest, Vitest, RSpec, Pytest | Test config files |
| Database | Postgres, MongoDB, Prisma | Config, migrations |
| Validation | Zod, Yup, class-validator | Imports, schemas |
| Auth | Clerk, NextAuth, custom | Auth-related files |
4. Constraints to Surface
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.
- 1mo ago First seen · 327 lines · 354 tokens per session scan A 1775bcf72390
codebase-context-builder is an agent published in the GitHub repository MoizIbnYousaf/Ai-Agent-Skills (1,152 stars, last pushed 29d ago), licensed MIT. It adds 354 tokens to every session and 2,407 once invoked, about $0.0014 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 2026-08-30.
Other agents, from other repositories
e2e-runner
End-to-end testing specialist using Playwright. Generates, maintains, and runs E2E tests.
code-reviewer
Reviews the diff against the four execution principles. Use after changing code.
test-runner
Automated test execution and analysis agent.
planner
Draft lawbook change artifacts and ceremony level. Use when Cortex stage is planning. Asks clarifying questions via the coordinator; never edits src/.
explorer
Read-only codebase investigation for a lawbook change. Use when the Cortex stage is exploring (or investigate for bugs). Compass-first; writes nothing under lawbook/ or src/.
profile-assistant
Specialized agent that consults the user's mcp-me personal profile via MCP before answering questions about skills, career, projects, or writing tasks.