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 instructions/distantorigin/mcp-telnet/claude-mdgit clone --depth 1 https://github.com/distantorigin/mcp-telnetWhat 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 | $0.00719 | $0.00719 |
| Opus 5 | $0.00360 | $0.00360 |
| Sonnet 5 | $0.00144 | $0.00144 |
| Haiku 4.5 | $0.00072 | $0.00072 |
Grade A, and why
mcp-telnet CLAUDE.md 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 3d 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 — 77 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.
Build Commands
npm run build- Compiles TypeScript to JavaScript, makes scripts executable, and updates versionnpm run prepare- Runs build (executed automatically on npm install)npm run watch- Watches TypeScript files for changes and recompiles
No test suite is configured in this project.
Architecture Overview
This is an MCP (Model Context Protocol) server that enables LLMs to interact with telnet-based services like MUDs, legacy systems, and network equipment.
Core Components
MCP Server Layer (src/server.ts, src/index.ts)
- Entry point that initializes the MCP server using the @modelcontextprotocol/sdk
- Registers tools, handles identity management, and manages stdio transport
- Starts both the MCP server and interactive CLI concurrently
Tool System (src/tools/)
- All MCP tools are registered in
src/tools/index.tswith schema definitions - Each tool handler is in separate modules (connect, command, status, etc.)
- Tools include connection management, command sending, session logging, and memory storage
Connection Management (src/connection/)
telnet.ts- Core telnet client implementation with protocol handlingstate.ts- Connection state management and response buffering- Supports automatic reconnection, keep-alive, and MTTS identification
Configuration System (src/config/)
loader.ts- Loads configurations and saved connections from~/.mcp-telnet/identity.ts- Manages LLM identity for access controltypes.ts- TypeScript types for configuration objects
CLI Interface (src/cli/)
- Separate interactive CLI that runs on port 9000 for direct telnet management
- Allows manual login and credential entry outside of LLM context
Key Design Patterns
Identity-Based Access Control
- LLM must identify itself using
set_llm_identitybefore telnet connections are allowed - Prevents unauthorized access and provides audit trails
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.
- 3d ago First seen · 77 lines · 719 tokens per session scan A 7eea7aa661a3
mcp-telnet CLAUDE.md is an instructions file published in the GitHub repository distantorigin/mcp-telnet (11 stars, last pushed 14d ago), licensed MIT. It adds 719 tokens to every session, about $0.0036 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 2026-08-31.
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).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
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 oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.