context-detection

context-detection is a skill for Claude Code, Codex from MadAppGang/claude-code. It costs 39 tokens per session (5,834 once invoked), scanned A, original, MIT.

A project-inspection guide for identifying the technologies used in a codebase from its files, settings, and folder structure. It can recognise projects that combine several stacks, such as a React frontend with a Go backend.

In plain words
What is it for?
Use it at the start of a task to identify languages and frameworks, inspect full-stack projects, or discover technology-specific skills in nested projects and monorepos.
Why use it?
It helps load relevant guidance automatically, so work is based on the actual project instead of assumptions about its technology.

Skill for Claude CodeCodex

Installs and runs on its own, but its text points at files inside its plugin — anything it tells you to read at a ${CLAUDE_PLUGIN_ROOT} path is only there once the plugin is installed. Installing the plugin gets both.

Part of the dev plugin — 47 skills, 12 commands, 14 agents shipped together

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/madappgang/claude-code/context-detection
Any agent
npx skills add MadAppGang/claude-code --skill context-detection
Clone the repo
git clone --depth 1 https://github.com/MadAppGang/claude-code

Made for: Claude Code, Codex.

Or install dev, the plugin that ships this one along with the rest of its 47 skills, 12 commands, 14 agents.

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 context-detection

README.md
[![agentmods](https://agentmods.dev/badge/skills/madappgang/claude-code/context-detection.svg)](https://agentmods.dev/skills/madappgang/claude-code/context-detection)
Your own site
<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>
Per session 39 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 5,834 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 $0.00039 $0.05834
Opus 5 $0.00019 $0.02917
Sonnet 5 $0.00008 $0.01167
Haiku 4.5 $0.00004 $0.00583

Measured yesterday against content hash aed93c62ae38, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

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.

The scan reads SKILL.md. This mod also ships 1 executable file (scripts/discover-skills.js), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

plugins/dev/skills/context-detection/SKILL.md · 886 lines

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:

  1. Personal: ~/.claude/skills/
  2. Project: .claude/skills/
  3. Nested (monorepos): **/.claude/skills/
  4. Legacy commands: .claude/commands/
  5. Marketplace plugins: ~/.claude/plugins/marketplaces/{m}/plugins/{p}/skills/
  6. Local plugins: .claude-plugin/skills/, plugins/*/skills/
  7. 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"]

Read the full file on GitHub · 886 lines

Files

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.

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. yesterday First seen · 886 lines · 39 tokens per session scan A aed93c62ae38

Subscribe to this mod's changes

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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