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/madappgang/claude-code/context-detectionnpx skills add MadAppGang/claude-code --skill context-detectiongit clone --depth 1 https://github.com/MadAppGang/claude-codeWrote 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/madappgang/claude-code/context-detection)<a href="https://agentmods.dev/skills/madappgang/claude-code/context-detection"><img src="https://agentmods.dev/badge/skills/madappgang/claude-code/context-detection.svg" alt="Measured on agentmods" 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 | $0.00039 | $0.05834 |
| Opus 5 | $0.00019 | $0.02917 |
| Sonnet 5 | $0.00008 | $0.01167 |
| Haiku 4.5 | $0.00004 | $0.00583 |
Grade A, and why
context-detection scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured yesterday.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
How it starts
The opening of the file, as written. The whole thing — 886 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Context Detection Skill
Quick Start: Skill Discovery Script
Run the helper script to discover ALL skills available to a project:
node "${CLAUDE_PLUGIN_ROOT}/skills/context-detection/scripts/discover-skills.js" "$(pwd)"
This searches all 7 official Claude Code skill locations:
- Personal:
~/.claude/skills/ - Project:
.claude/skills/ - Nested (monorepos):
**/.claude/skills/ - Legacy commands:
.claude/commands/ - Marketplace plugins:
~/.claude/plugins/marketplaces/{m}/plugins/{p}/skills/ - Local plugins:
.claude-plugin/skills/,plugins/*/skills/ - Enterprise (managed settings)
Output: JSON with summary stats and full skill metadata.
For detailed documentation on the script, see scripts/discover-skills.js.
Overview
The context detection skill provides systematic patterns for analyzing any project to determine its technology stack(s). It enables the dev plugin to auto-load appropriate framework-specific skills based on what's actually in the project.
Key Innovation: Multi-stack detection for fullstack projects (e.g., React + Go).
Detection Priority
Detection follows a priority order from most explicit to most inferred:
1. Explicit User Preference (Highest Priority)
Source: .claude/settings.json
{
"pluginSettings": {
"dev": {
"stack": ["react-typescript", "golang"],
"features": {
"testing": "vitest",
"api": "rest"
}
}
}
}
When to use:
- User wants to override auto-detection
- Project has ambiguous structure
- Custom stack combinations
2. Current File Context
Source: File extension of current editing context
extension_mappings:
".tsx": ["react-typescript", "testing-frontend"]
".vue": ["vue-typescript", "testing-frontend"]
".go": ["golang", "testing-strategies"]
".dingo": ["dingo", "golang", "testing-strategies"]
".rs": ["rust", "testing-strategies"]
".py": ["python", "testing-strategies"]
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.
- yesterday First seen · 886 lines · 39 tokens per session scan A aed93c62ae38
context-detection is a skill published in the GitHub repository MadAppGang/claude-code (279 stars, last pushed 5mo ago), licensed MIT. It adds 39 tokens to every session and 5,834 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 2026-09-03.
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