# Letterin Muse connector

From musedirectory.ai, the independent directory of Meta Muse connectors. Not affiliated with Meta.

## Letterin

Tailor your CV to job postings with match scoring and rewrite suggestions.

- Record: https://musedirectory.ai/connector/letterin
- Category: Productivity
- Developer: letterin.app (https://letterin.app)
- Muse status: Extra setup. Not in Muse's Connectors list yet. Muse can still use it: its page gives you a request to paste into Muse.
- Health: Working, sign-in needed, 1046ms, checked 2026-10-29T09:16:16Z
- Endpoint: https://letterin.app/api/mcp
- Auth: Needs an access key; Pricing: unknown
- Screening: Screened, no issues found (2026-10-28T17:21:24Z)
- Source: Found in the official MCP Registry (app.letterin/letterin) https://registry.modelcontextprotocol.io/v0/servers?search=app.letterin%2Fletterin

Letterin helps job seekers customize their resume for specific job postings. It scores how well your CV matches the job, proposes edits you can review, and exports the result as PDF or Word.

Example request: "Score how well my resume matches this job posting and suggest changes to improve the fit."

How to connect: Not in Muse's Connectors list yet, but Muse can still use it. Paste this into Muse: "Use Letterin to help me. It is a free service with an MCP server at https://letterin.app/api/mcp. It needs an API key from letterin.app; ask me to enter it through your secure credential prompt. Ask me before you share anything with it." Muse asks before it shares anything with the app's site. Meta does not review apps used this way, so only use ones you trust. We tested this in the Muse app on September 24, 2026: Muse used an app's link directly this way and returned a live answer.

Screening checks:
- MCP handshake: pass (Requires sign-in)
- Domain against threat feeds (Cloudflare security DNS): pass (letterin.app not flagged)
- Published packages against the OSV malicious-package database: n/a (No npm or PyPI package published)
- Hidden instructions or invisible characters in tool text: n/a (Tools are behind sign-in)
- Inputs asking for passwords, card numbers or seed phrases: n/a (Tools are behind sign-in)
- Domain and redirects: pass (Domain registered 40 days ago)
- AI review of purpose and tool behavior: pass (No concerns)