QAmcp

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Directory / Postel

Postel

Q: Is Postel MCP server safe?

QAmcp's test on 5 Nov 2026: None of the hidden-instruction wordings we know were found in its 17 tool descriptions. Its error messages showed no secrets or internal details. 8 of its 17 tools are labeled read-only; the others may change or send things. Overall it scored 95/100 on 5 Nov 2026. A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

by postel.app · https://www.postel.app/api/mcp

Write posts in your voice from what's going viral in your niche. Schedule to X, LinkedIn and more.

17 tools✓ no account neededPricing: not listed

Visit website

95 /100

PASS · WITH NOTES

11 of 11 checks · 5 Nov 2026

Test it now for current results

At a glance

Runs where: On their server. What you send to it goes to them.
What you need: Nothing: it answered without a login
Tools: 17 tools
Its own safety labels: 8 read-only, 5 labeled as deleting or destroying, 4 labeled as changing things
Memory it takes: About 3,200 tokens of your AI's memory, just for its tool descriptions
Largest answer: About 16.6 KB in our test
Speed: Average answer in our test: 310 ms

Tokens are an estimate: the characters in its tool names, descriptions and inputs, divided by 4. The exact number depends on your AI model. Safety labels are what the server says about itself. From our latest test, 5 Nov 2026.

Is Postel MCP server safe?

None of the hidden-instruction wordings we know were found in its 17 tool descriptions.
Its error messages showed no secrets or internal details.
8 of its 17 tools are labeled read-only; the others may change or send things.
Overall it scored 95/100 on 5 Nov 2026.

A test can only see what the server shows from outside, not what it does with your data behind the scenes. Connect servers from makers you trust.

What this test does not check

Its source code and packages.
What a tool quietly does behind the scenes, such as writing a file or calling another service.
Instructions hidden inside live tool answers. We only look for those in tool descriptions.
Hidden instructions worded in a way our list doesn't know yet.
Tools that could change something. Those are read, never run.

What QAmcp can and can't see · How to tell if an MCP server is safe · Hidden instructions · Prompt injection

Known security advisories

Not looked up yet. QAmcp tests how a server behaves. It does not scan source code.

What it can do

17 tools, in the server's own words.

search-viral-tweetsread-only

Find high-performing public X posts in Postel's index by topic, with source links and stored engagement metrics.

list-postsread-only

List posts for the current organization.

get-postread-only

Get a single post by ID with full details.

create-post

Save text as a new draft in Postel, optionally with images or videos downloaded from public URLs and a LinkedIn first comment (up to 1250 characters).

update-post

Update the content or status of a Postel draft.

delete-post

Delete a post.

schedule-post

Schedule a Postel draft for publishing to the social platform stored on the post.

publish-post

Publish a Postel draft immediately to the social platform stored on the post.

create-posts

Create up to 25 posts in one call.

attach-media

Download an image or video from a public URL and attach it to a Postel draft.

generate-post

Generate a new post using AI based on a prompt and save it as a draft, ready for update-post, schedule-post or publish-post.

refine-post

Suggest refined content for an existing post using AI and specific instructions.

list-brandsread-only

List all brands (topics) for the current organization.

get-brand-sourcesread-only

Get background information sources for a specific brand.

get-x-profilesread-only

Get the X and LinkedIn voice profiles for the current organization.

get-scheduleread-only

Get the posting schedule template for the current organization.

get-usageread-only

Get the organization's AI credit balance (monthly allowance, rollover, bonus/top-ups, reset date) and Lite mode status.

Test results

Safe mode: only tools labeled read-only were run. How the test works

!
Ready for the newest MCP version
1 warning
- !Uses an older MCP version (2025-11-25). It works today, but it isn't on the July 2026 version (2026-07-28) yet.
note
!
Follows MCP best practices (not scored yet)
1 tip (not scored)
- !9 tools not labeled read-only don't say whether running them twice is safe (idempotentHint): create-post, update-post, delete-post, schedule-post, publish-post, create-posts and 3 more
note
✓
ConnectsConnected in 1.0 s
pass
✓
Lists its toolsFound 17 tools
pass
✓
Every tool is describedAll 17 tools and their inputs are described
pass
✓
Tools are labeled safe or dangerousEvery tool has a safety label
pass
✓
No known hidden instructionsNone of the hidden-instruction wordings we know were found in tool descriptions. New wordings can get past this check.
pass
✓
Tools work with good inputs
All good
- ✓search-viral-tweets: Worked (310 ms)
- –list-posts: Needs you to sign in, so it was not tested (not counted against the server)
- –get-post: Needs you to sign in, so it was not tested (not counted against the server)
- –list-brands: Needs you to sign in, so it was not tested (not counted against the server)
- –get-brand-sources: Needs you to sign in, so it was not tested (not counted against the server)
- –get-x-profiles: Needs you to sign in, so it was not tested (not counted against the server)
- –get-schedule: Needs you to sign in, so it was not tested (not counted against the server)
- –get-usage: Needs you to sign in, so it was not tested (not counted against the server)
- and 9 more
pass
✓
Bad inputs give a clean error
All good
- ✓search-viral-tweets: Refused wrong type for "query" with a clear error
- –list-posts: Needs you to sign in, so bad inputs were not tested
- –get-post: Needs you to sign in, so bad inputs were not tested
- –get-brand-sources: Needs you to sign in, so bad inputs were not tested
pass
✓
Fast enough
All good
- ✓Connecting took 1.0 s
- ✓Listing tools took 224 ms
- ✓Average tool answer: 310 ms
- ✓search-viral-tweets: Slowest tool: search-viral-tweets (310 ms)
pass
✓
No secrets leakedChecked 13 error messages: no secrets or internal details
pass
–
Tools work togetherNo tool's answer could be fed into another tool, so there were no chains to test (not counted either way)
not tested

Test it yourself

Free and open source. Same checks, same score.

npx qamcp-cli https://www.postel.app/api/mcp

Show this score on GitHub

Free for every server in the directory. Paste this into your README: the badge shows the score from our latest test.

[![QAmcp score](https://qamcp.dev/s/app-postel-postel.svg)](https://qamcp.dev/s/app-postel-postel.html)

Score over time

5 Nov 202695

One test so far. New tests will show here.

Reviews

Coming soon: reviews from people who use Postel, signed in with GitHub, one per person. Reviews never change the score.

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