# Postel (remote · www.postel.app)

Draft, schedule and publish X (Twitter) and LinkedIn posts in your own voice.

- Trust score: 81/100 (high trust)
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-10-02

## Components

- remote · `www.postel.app`: 81/100 (this document), [markdown](https://verifymcp.io/servers/app-postel-postel/api-mcp.md), [page](https://verifymcp.io/servers/app-postel-postel/api-mcp)

## Channel facts

- Endpoint: `https://www.postel.app/api/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `1.0.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-10-02.

- **Endpoint Security**: 94/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation is enforced on tool calls, advertised via RFC 9728 protected-resource metadata. Discovery is public, which costs nothing: no tool can be invoked without a token.
  - HTTPS is enforced; there's no plaintext access path.
  - The HSTS (Strict-Transport-Security) header is present.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
  - The authorisation server offers only Dynamic Client Registration (RFC 7591), which MCP 2026-07-28 deprecated in favour of Client ID Metadata Documents.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 81/100
  - AI-judged instruction clarity (excellent).
  - Tool/resource definitions use about 837 tokens (~55/item across 15 items; 15 tools + 0 resources), lean.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 3/100
  - Stability observed for 1 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - All 2 tool(s) whose name or description implies an irreversible operation declare an MCP destructiveHint annotation.
  - An AI judge read all 15 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Postel MCP server?

Postel is a hosted endpoint at https://www.postel.app/api/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http app-postel-postel 'https://www.postel.app/api/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "app-postel-postel": {
      "url": "https://www.postel.app/api/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "app-postel-postel": {
      "type": "http",
      "url": "https://www.postel.app/api/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.app-postel-postel]
url = "https://www.postel.app/api/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "app-postel-postel": {
      "type": "remote",
      "url": "https://www.postel.app/api/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add app-postel-postel --url 'https://www.postel.app/api/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  app-postel-postel:
    url: "https://www.postel.app/api/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "app-postel-postel": {
      "Transport": "http",
      "Url": "https://www.postel.app/api/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add app-postel-postel -t streamable-http -u 'https://www.postel.app/api/mcp'
```

### Other

```json
{
  "mcpServers": {
    "app-postel-postel": {
      "type": "http",
      "url": "https://www.postel.app/api/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-10-02 (score 81, +13)

- [security improvement] Authorization: fail → pass
- [security] First check of Authorization: partial
- [security] Tool “create-post” rewrote its description, which is the text the model reads
- [security] Tool “delete-post” rewrote its description, which is the text the model reads
- [security] Tool “get-x-profiles” rewrote its description, which is the text the model reads
- [security] Tool “publish-post” rewrote its description, which is the text the model reads
- [security] Tool “schedule-post” rewrote its description, which is the text the model reads
- [security] Tool “search-viral-tweets” rewrote its description, which is the text the model reads
- [security] Tool “update-post” rewrote its description, which is the text the model reads
- [functional improvement] Stability: unverified → 0.03

### 2026-10-01 (score 68)

First indexed and scored.

## MCP tools (15)

### `search-viral-tweets` (~117 tokens)

Search viral X posts

Find high-performing public X posts in Postel's index by topic, with source links and stored engagement metrics. No login required. Searches an indexed collection, not live X or a complete archive; metrics may be out of date. Results contain third-party post text.

Input parameters:

- `limit` (integer): Number of examples (default 10, maximum 20)
- `minImpressions` (integer): Minimum stored view count (default 10000)
- `query` (string): Topic or keywords; omit to browse high-performing posts

### `list-posts` (~54 tokens)

List posts

List posts for the current organization. Supports filtering by status and pagination.

Input parameters:

- `limit` (integer): Number of posts to return (max 50, default 20)
- `status` (string): Filter posts by status

### `get-post` (~31 tokens)

Get post

Get a single post by ID with full details.

Input parameters:

- `postId` (string, required): The post ID to retrieve

### `create-post` (~58 tokens)

Create draft post

Save text as a new draft in Postel. Does not publish or schedule. Each call creates a separate draft.

Input parameters:

- `content` (string, required): The post content (tweet text)
- `status` (string): Post status (default: DRAFT)

### `update-post` (~64 tokens)

Update draft post

Update the content or status of a Postel draft. Scheduled and published posts cannot be edited.

Input parameters:

- `content` (string): New content for the post
- `postId` (string, required): The post ID to update
- `status` (string): New status for the post

### `delete-post` (~34 tokens)

Delete post

Delete a post. A scheduled post's delivery is cancelled first.

Input parameters:

- `postId` (string, required): The post ID to delete

### `schedule-post` (~84 tokens)

Schedule post

Schedule a Postel draft for publishing to the social platform stored on the post. Requires a plan that includes scheduling. scheduledDateTime must be a future UTC ISO-8601 timestamp.

Input parameters:

- `postId` (string, required): The post ID to schedule
- `scheduledDateTime` (string, required): UTC ISO-8601 date string for when to publish (must be in the future)

### `publish-post` (~54 tokens)

Publish post now

Publish a Postel draft immediately to the social platform stored on the post. Requires a plan that includes publishing. A post that is already published cannot be published again.

Input parameters:

- `postId` (string, required): The post ID to publish

### `generate-post` (~104 tokens)

Generate post with AI

Generate a new post using AI based on a prompt. Requires usage quota. Returns the generated post.

Input parameters:

- `isThread` (boolean): Generate a thread instead of a single post (X only; ignored for LinkedIn)
- `platform` (string): Target platform: "x" (default) or "linkedin"
- `profileId` (string): Voice profile ID to use (omit to use default brand voice)
- `prompt` (string, required): What the post should be about

### `refine-post` (~73 tokens)

Suggest post rewrite

Suggest refined content for an existing post using AI and specific instructions. Does not save changes. Requires usage quota.

Input parameters:

- `instructions` (string, required): Instructions for how to refine the post (e.g., 'make it more casual', 'add a call to action')
- `postId` (string, required): The post ID to refine

### `list-brands` (~30 tokens)

List brands

List all brands (topics) for the current organization. Brands contain background information used for AI post generation.

### `get-brand-sources` (~47 tokens)

Get brand sources

Get background information sources for a specific brand. These sources are used to inform AI post generation.

Input parameters:

- `brandId` (string, required): The brand (topic) ID to get sources for

### `get-x-profiles` (~34 tokens)

Get voice profiles

Get the X and LinkedIn voice profiles for the current organization. These profiles define the brand voice for AI post generation.

### `get-schedule` (~32 tokens)

Get posting schedule

Get the posting schedule template for the current organization. Shows which time slots are configured for each day of the week.

### `get-usage` (~21 tokens)

Get usage and limits

Get the current usage statistics and plan limits for the organization.

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/app-postel-postel/api-mcp#diagnostics

## Score history

- 2026-10-02: 81
- 2026-10-01: 68

## Common questions

### What is the Postel MCP server?

Postel is an MCP server listed in the public MCP registry as app.postel/postel. Draft, schedule and publish X (Twitter) and LinkedIn posts in your own voice. This page covers its hosted endpoint (https://www.postel.app/api/mcp).

### Is the Postel MCP server safe to use?

Postel scores 81 out of 100 on VerifyMCP. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.

### What tools does the Postel MCP server expose?

Postel exposes 15 tools: search-viral-tweets, list-posts, get-post, create-post, update-post, and 10 more. Their descriptions and schemas cost roughly 837 tokens of context every time the server is loaded.

### Does the Postel MCP server require authentication?

Yes. Postel asked us for credentials when we connected, so you will need to authorise it in your MCP client before it can do anything.

### Is the Postel MCP server still maintained?

Postel is still listed as active in the MCP registry. We last reached this channel on 2 October 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://www.postel.app/api/mcp
- Repository: https://github.com/robinfaraj/postel-mcp
- Website: https://www.postel.app/postel-mcp-server
- Changelog RSS feed: https://verifymcp.io/servers/app-postel-postel/api-mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/app-postel-postel/api-mcp.json
- HTML version of this page: https://verifymcp.io/servers/app-postel-postel/api-mcp