Borrowing it
Nothing to install: this file belongs to foxj77/claudectx. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/foxj77/claudectx/main/CLAUDE.mdgit clone --depth 1 https://github.com/foxj77/claudectxWrote 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/instructions/foxj77/claudectx/claude-md)<a href="https://agentmods.dev/instructions/foxj77/claudectx/claude-md"><img src="https://agentmods.dev/badge/instructions/foxj77/claudectx/claude-md/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/instructions/foxj77/claudectx/claude-md"><img src="https://agentmods.dev/badge/instructions/foxj77/claudectx/claude-md.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 | $0.01034 | $0.01034 |
| Opus 5.5 | $0.00414 | $0.00414 |
| Sonnet 5.5 | $0.00207 | $0.00207 |
| Haiku 4.5 | $0.00103 | $0.00103 |
Grade B, and why
claudectx CLAUDE.md scanned grade B with 1 finding 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.
Reads agent configuration directoriesmediumAgent snooping
.claude/, .codex/, .gemini/ hold keys, settings and other credentials a mod has no legitimate need for.
- `~/.claude/settings.json` - Active settings How it starts
The opening of the file, as written. The whole thing — 109 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Project Overview
claudectx is a Go CLI tool for fast, safe profile switching in Claude Code. It manages configuration profiles stored in ~/.claude/profiles/, enabling switching between different settings, CLAUDE.md files, and MCP servers.
Build & Test Commands
make build # Build binary (outputs ./claudectx)
make install-user # Install to ~/go/bin (recommended, no sudo)
make test # Run all unit tests
make test-coverage # Run tests with coverage
go test ./... -v # Verbose test output
go vet ./... # Static analysis
Architecture
Core Data Flow
main.go (CLI argument routing)
→ cmd/*.go (command implementations)
→ internal/store (profile CRUD)
→ internal/config, internal/mcpconfig, internal/profile (data structures)
→ ~/.claude/ (filesystem)
Key Packages
| Package | Purpose |
|---|---|
internal/store |
Profile persistence, tracks current/previous profile |
internal/config |
Settings struct (Env, Model, Permissions), JSON I/O — unknown fields are preserved transparently via extras map[string]json.RawMessage |
internal/mcpconfig |
MCP server configs from ~/.claude.json |
internal/paths |
Centralized path resolution for Claude files |
internal/printer |
Colored terminal output (respects NO_COLOR) |
internal/backup |
Timestamped backups before switching |
internal/validator |
Settings and CLAUDE.md validation |
Key Paths
~/.claude/settings.json- Active settings~/.claude/CLAUDE.md- Global instructions~/.claude.json- MCP server configurations~/.claude/profiles/<name>/- Stored profiles~/.claude/.claudectx-current- Current profile tracker
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 · 109 lines · 1,034 tokens per session scan B 705e131dd708
claudectx CLAUDE.md is an instructions file published in the GitHub repository foxj77/claudectx (143 stars, last pushed 9d ago), licensed MIT. It adds 1,034 tokens to every session, about $0.0041 per session on Opus 5.5. A static security scan graded it B with 1 finding (reads agent configuration directories). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
Other instructions, from other repositories
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, cache eligibility and rollout and applying the notice (cutover).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode copilot-instructions.md
Copilot instructions for microsoft/vscode, covering vs code copilot instructions, project overview, root folders, core architecture (src/ folder) and built-in extensions (extensions/ folder).
vscode model-prompts.instructions.md
Model-specific prompt authoring and registry guidelines.