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 agentmods add skills/adamthewilliam/grepika/learn-codebasenpx skills add adamthewilliam/grepika --skill learn-codebasegit clone --depth 1 https://github.com/adamthewilliam/grepikaWhat 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 | $0.00056 | $0.00956 |
| Opus 5 | $0.00028 | $0.00478 |
| Sonnet 5 | $0.00011 | $0.00191 |
| Haiku 4.5 | $0.00006 | $0.00096 |
Grade A, and why
learn-codebase 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 2d 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 — 141 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Learn Codebase Skill
You are a codebase guide helping developers onboard and understand the architecture.
Input
Area of interest: $ARGUMENTS
If no area specified, provide a general codebase overview. If an area is specified (e.g., "auth", "api", "database"), focus on that subsystem.
Pre-check
If any tool returns "No active workspace", call mcp__grepika__add_workspace with the project root first, then retry the tool.
Learning Workflow
-
Get codebase statistics
- Use
mcp__grepika__statswithdetailed: true - Understand languages, file count, and codebase size
- Use
-
Show directory structure
- Use
mcp__grepika__tocto display the tree - Identify main directories and their purposes
- Use
-
Find key files for the area
- Use
mcp__grepika__searchto find important files - For general overview, search for: "main entry point", "configuration", "core logic"
- For specific areas, search for that topic
- Use
-
Extract structure of main files
- Use
mcp__grepika__outlineon the most important files - Show exports, functions, classes, and types
- Use
-
Read key sections
- Use
mcp__grepika__getto show important code snippets - Focus on entry points, configuration, and core abstractions
- Use
Output Format
General Overview
## Codebase Overview
### Statistics
- **Languages**: [breakdown]
- **Total files**: [count]
- **Lines of code**: [estimate]
### Directory Structure
[tree view with annotations]
### Architecture Summary
[2-3 paragraphs explaining the high-level design]
### Key Modules
| Module | Location | Purpose |
|--------|----------|---------|
| [name] | [path] | [what it does] |
### Entry Points
- **Main**: [path] - [description]
- **API**: [path] - [description]
- **CLI**: [path] - [description]
### Configuration
- [list config files and their purposes]
### Recommended Reading Order
1. [file] - Start here to understand [concept]
2. [file] - Then learn about [concept]
3. [file] - Finally explore [concept]
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 2d ago First seen · 141 lines · 56 tokens per session scan A bbcb4e6fa998
learn-codebase is a skill published in the GitHub repository adamthewilliam/grepika (134 stars, last pushed 20d ago), licensed MIT. It adds 56 tokens to every session and 956 once invoked, about $0.0003 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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auto-perf-optimize
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chat-perf
Run chat perf benchmarks and memory leak checks against the local dev build or any published VS Code version. Use when investigating chat rendering regressions, validating perf-sensitive changes to chat UI, or checking for memory leaks in the chat response pipeline.
chat-pet-sprite-creation
Use when creating or changing VS Code chat pet sprite art, sprite sheets, state animations, eye treatments, Stable/Insiders variants, or pet transitions under src/vs/workbench/contrib/chat/browser/widget/media/chatPet.
cpu-profile-analysis
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