Inbox Zero
Search Gmail and Outlook, save drafts, manage email rules, and view email stats.
Runs in the cloud
Crimson Crab MCP Template
Overview
Description from the maker (original English)
Ready-to-clone Rust MCP server with chat, token-counting, and model tools for Claude
PopNx MCP’s three pillars
These three are never merged into one score: opinions, measurements and popularity are different things.
- User voiceiNo reviews yetReviews open together with accounts in a later step
- Our basic checksi2 of 2 passedChecked from public information; code not scanned yet
- UsageiVery new★ 0
What you can do with it
We have not written a plain-language summary for this one yet. Below are the facts we read from the registry.
- Connection: –
- Transport:
- Category: Chat & email
Install
Pick the AI app you use, then copy the settings.
Before you install
- Basic checks: 2 of 2 passed
- Runs on your computer with your user’s permissions (files, network, apps).
- The registry lists no key to fill in.
The maker has not listed install details in the registry. See the maker’s README below.
What it can do
Runs on your computer; the tool list appears in your AI app after you install it.
Basic checksi
We check information anyone can see; we have not read the code. Checks that do not apply are left out of the count. · Checked Nov 11, 2026
- ✓ Pass
Maker matches the repo
The registry name was verified with the GitHub account singhpratech, which owns the repo
- ✓ Pass
Still maintained
Code last changed 8 days ago
- … Not checked yet
Has a licence
We have not read this repo from GitHub yet
- – Not applicable
Endpoint responds
This one runs on your computer; there is no internet endpoint
- – Not applicable
Sign-in with OAuth
Runs on your computer and uses local settings instead
- … Not checked yet
No hidden instructions in tool descriptions
Runs on your computer; we can only read tool lists from internet endpoints
Compared with others in Chat & emaili
- More stars than 0% of the other 1932 servers in this category
- Published to the registry more recently than 19% of the other 1932 servers in this category
- Basic checks equal to or better than 100% of the other 1932 servers in this category
Compared with every active server in this category in the registry. Stars count only when the publisher owns the repo.
Common questions
Is Crimson Crab MCP Template safe?
It passed 2 of 2 applicable basic checks. We have not read the code. Before adding a key or token, see what access the server asks for and use a key with only the permissions you need.
What keys or codes does it need?
The registry does not list a required key, though some servers ask you to sign in on first use.
Does it run on my computer or in the cloud?
It runs on your computer. Your AI app starts it when needed, and data does not pass through the maker’s servers (unless it calls an online service itself).
Is it still maintained?
The GitHub repo last changed 8 days ago, and the latest version (0.3.1) reached the registry 3 months ago.
Which apps can use it?
Apps that support MCP, such as Claude Desktop, Claude Code, Cursor and VS Code.
What can I use instead?
In the same category: Inbox Zero, Agent-Native Mail, Agent-Native Dispatch
Alternatives
Servers in the same category from other makers, sorted by stars.
Reading a card:↓ Downloads per weeki★ GitHub starsiThree pillars: reviews · checks · usageiUpdated = latest version published to the registryi
Agent-Native Mail
Agent-Native Superhuman - email client with keyboard shortcuts and AI triage
Runs in the cloud
Agent-Native Dispatch
Central Slack/Telegram router with jobs, memory, approvals, and A2A delegation
Runs in the cloud
README from the maker
Open the README
Copied from the maker’s repo as written. PopNx MCP has not reviewed or endorsed it. HTML, images and scripts are removed. Links lead off this site.
Claude-powered MCP server in Rust (starter template)
A minimal, production-ready Model Context Protocol (MCP) server, written in Rust, backed by Anthropic's Claude API through the crimson-crab SDK. It exposes five tools: ask_claude (send a prompt, get Claude's reply), chat (multi-turn conversation), count_tokens (price a prompt without running it), list_models (enumerate the models your API key can use), and get_model (limits and metadata for one model).
Use it as the reference starting point for building your own Claude-powered MCP tools in Rust.
Use this template
Click Use this template on GitHub, or generate a fresh project with cargo generate:
cargo generate --git https://github.com/singhpratech/crimson-crab-mcp-templateYou can also just clone it:
git clone https://github.com/singhpratech/crimson-crab-mcp-templateQuickstart
export ANTHROPIC_API_KEY=sk-ant-...cargo run
The server communicates over stdio, so running it directly just waits for an MCP client to connect. All logging goes to stderr — stdout is reserved for the MCP protocol. Set RUST_LOG=debug for more verbose logs.
To build an optimized binary you can point a client at:
cargo build --release-> target/release/crimson-crab-mcp-template
Wire it into Claude Desktop
Add an entry to your Claude Desktop MCP config (claude_desktop_config.json), pointing at the built binary and passing your API key through the environment:
{"mcpServers": { "claude-via-crimson-crab": { "command": "/absolute/path/to/target/release/crimson-crab-mcp-template", "env": { "ANTHROPIC_API_KEY": "sk-ant-..." } } } }
Restart Claude Desktop; the ask_claude, chat, count_tokens, list_models, and get_model tools will then be available.
The tools
ask_claude
| Parameter | Type | Required | Description |
|---|---|---|---|
prompt | string | yes | The prompt to send to Claude. |
system | string | no | Optional system prompt. |
Builds a Claude Messages request (defaulting to the claude-opus-5 model), calls the API, and returns the concatenated text of Claude's reply.
chat
| Parameter | Type | Required | Description |
|---|---|---|---|
messages | array | yes | The conversation so far, oldest first: {role, content} where role is an enum constrained to "user" or "assistant". Must end with a user turn. |
system | string | no | Optional system prompt. |
model | string | no | Model id (defaults to the ask_claude model). |
max_tokens | integer | no | Maximum tokens to generate (default 1024). |
Sends the whole message history to Claude and returns the next reply — use it instead of ask_claude when the caller needs to keep context across turns.
count_tokens
| Parameter | Type | Required | Description |
|---|---|---|---|
prompt | string | yes | The prompt whose token count you want. |
system | string | no | Optional system prompt to include in the count. |
model | string | no | Model id to count against (counts are model-specific). |
Returns the number of input tokens the prompt would consume, without running it — useful for estimating cost before an expensive call.
list_models
| Parameter | Type | Required | Description |
|---|---|---|---|
limit | integer | no | Maximum number of models to return. |
Returns the id, display name, and release date of each Claude model available to the configured API key.
get_model
| Parameter | Type | Required | Description |
|---|---|---|---|
model | string | yes | The model id to look up, e.g. claude-opus-5. |
Returns the model's display name, release date, context window (max_input_tokens), and maximum output tokens.
Errors from all tools are returned as MCP tool errors rather than panicking. The Claude client is built once at startup and reused across calls.
Built with crimson-crab
This template is built with crimson-crab — a production-grade Rust SDK for Anthropic's Claude API. Source: https://github.com/singhpratech/crimson-crab.
License
Licensed under either of
- MIT license (LICENSE-MIT)
- Apache License, Version 2.0 (LICENSE-APACHE)
at your option.
crimson-crab is an independent open-source project and is not affiliated with Anthropic.