Borrowing it
Nothing to install: this file belongs to tambo-labs/charming-mcp. 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/tambo-labs/charming-mcp/main/AGENTS.mdgit clone --depth 1 https://github.com/tambo-labs/charming-mcpWrote 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/tambo-labs/charming-mcp/agents-md)<a href="https://agentmods.dev/instructions/tambo-labs/charming-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tambo-labs/charming-mcp/agents-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/tambo-labs/charming-mcp/agents-md"><img src="https://agentmods.dev/badge/instructions/tambo-labs/charming-mcp/agents-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 | $0.01371 | $0.01371 |
| Opus 5.5 | $0.00548 | $0.00548 |
| Sonnet 5.5 | $0.00274 | $0.00274 |
| Haiku 4.5 | $0.00137 | $0.00137 |
Grade A, and why
charming-mcp AGENTS.md scanned grade A 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- **MCP tools** (preferred): when Charming tools such as `create_app` and `update_app` are available, build with them directly. Do not use `curl`, `fetch`, or the raw HTTP API for app creation. Copies of this mod
1 near-identical copy found in the catalogue:
- charming-mcp GEMINI.md — 100% identical, 2 lines differ
How it starts
The opening of the file, as written. The whole thing — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
AGENTS.md
Instructions for AI coding agents working with Charming.
Charming is a hosted MCP server that generates, hosts, and updates interactive web apps. Ask it to build an app and you get back a live URL with persistent storage in seconds. The app stays live at that URL, and any MCP client can keep using and updating it.
Connect first
Charming is remote and hosted; there is nothing to clone, build, or run. Add the endpoint to your MCP settings:
| Client | Endpoint |
|---|---|
| Claude, Claude Code, Cursor, Codex, Gemini CLI, and most MCP clients | https://charm.ing/mcp |
| ChatGPT | the Charming listing in the ChatGPT Apps directory is one click; https://charm.ing/mcp/chatgpt is the Developer Mode fallback |
| Codex (plugin) | codex plugin marketplace add https://github.com/tambo-labs/charming-codex-plugin.git |
| Cursor | https://charm.ing/mcp (plus drop .cursor/rules/charming.mdc into your project) |
The MCP endpoints always require a bearer token; OAuth with Dynamic Client Registration bootstraps one automatically, with no API key to paste. Anonymous creation with no token is available on the HTTP path only, and an unclaimed app expires after 7 days. Auth guide: usecharming.com/auth.md. Per-client paste-strings: usecharming.com/clients.txt.
Two authoring paths
- MCP tools (preferred): when Charming tools such as
create_appandupdate_appare available, build with them directly. Do not usecurl,fetch, or the raw HTTP API for app creation. - HTTP API (fallback): only when MCP tools are unavailable and you have outbound HTTP access. Follow usecharming.com/build-http.md.
Build flow
- Read usecharming.com/start.md, then the surface-specific starter: build-mcp.md or build-http.md.
- Read usecharming.com/design.md before writing any UI, so the app avoids the generic-AI-app look.
- Create the first version, hand back the app URL and
app_id, then offer one concrete next iteration before editing again. - If a host does not render the app inline, share the URL; never claim it rendered inline unless it did.
- Hit a limitation? Call
submit_feedbackinstead of working around it silently.
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 Changed · -2 tokens per session 32aa0b8954b6
- 1mo ago First seen · 59 lines · 1,373 tokens per session scan A 323480807735
charming-mcp AGENTS.md is an instructions file published in the GitHub repository tambo-labs/charming-mcp (7 stars, last pushed yesterday), licensed MIT. It adds 1,371 tokens to every session, about $0.0055 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). 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).
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).
deno copilot-instructions.md
Copilot instructions for denoland/deno, covering deno development guide for github copilot, network access, high level overview, key directories and key files to understand first.