Mu MCP Server

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answering

Mu is answering right now. Last checked 13 min ago. It exposes 148 tools. Last commit 21 Sep 2026.

News, web search, mail, markets, weather, places, files, calendar, contacts. 67 tools, one endpoint.

Uptime history 50 days of history · worst day 96%

50 days agonow

100.0%

Uptime 24h

90 of 90 checks

148

Tools

read from the server

209 ms

Response time

average over 24h

434

Stars

last commit 21 Sep 2026

What changed 657

Every tool that appeared, vanished or quietly changed what it asks for. Recorded since 9 August 2026. No other catalogue keeps this.

19 Sep 148 tools appeared apps_build, apps_buildstatus, apps_create and 145 more

19 Sep 10 tools disappeared agent_ask, agent_list, inbox_list and 7 more

13 Sep 141 tools disappeared apps_build, apps_create, apps_edit and 138 more

13 Sep 10 tools appeared agent_ask, agent_list, inbox_list and 7 more

12 Sep 8 tools appeared images_daily, images_delete, images_get and 5 more

12 Sep a tool description was rewritten images_search

12 Sep a tool disappeared images_websearch

12 Sep a tool changed the parameters it asks for images_search

10 Sep a tool appeared mail_markread

8 Sep 4 tools changed the parameters they ask for news_list, tasks_list, tasks_update and 1 more

and 332 more, back to 9 August 2026

What the code does

We read the source, 9 h ago · tools taken from the live server · rules 3dff92dd89df

Evidence

Things with no honest explanation: a promise that contradicts the code, code that runs at install time while hiding what it does, data leaving the machine.

Deletes files or strips permissions service/shell/idle.go:196

            Command: "rm -rf -- " + quoted(home),

Capabilities

What this server is able to do. For an MCP server this is often the job itself — a terminal server runs commands because that is what it is for. Listed so you know what you are plugging in, not as an accusation.

Builds a file path from a variable internal/gtfs/store.go:231, internal/gtfs/build.go:444, internal/gtfs/index.go:67 и ещё 2

    final := filepath.Join(s.dir, id)

Builds a database query by concatenation service/chat/private.go:378

    select {
    case room.Broadcast <- RoomMessage{
        Content:   "@" + account + " " + what,

Page executes code built at runtime service/apps/seeds/dashboard/index.html:73, service/apps/seeds/habit-tracker/index.html:35, service/apps/seeds/markets/index.html:47 и ещё 6

    document.getElementById('weather-panel').innerHTML = html;

Page loads a third-party script service/video/watch.html:72

  <script src="https://www.youtube.com/iframe_api"></script>

Is this your server and something here is wrong? Tell us — corrections are free and do not require a plan.

We found things in this code

Code changes quietly between releases, and nobody reads the diff of a dependency. We do, on every release — watch Mu and you get told the day something new turns up.

Connect this server

Endpoint below is the one we actually reach during checks — not the one copied from a README. Last verified 13 min ago.

Claude Code Claude Desktop Codex Cursor VS Code

run in your terminal

claude mcp add mu --transport http https://micro.mu/mcp

~/Library/Application Support/Claude/claude_desktop_config.json

{
  "mcpServers": {
    "mu": {
      "url": "https://micro.mu/mcp"
    }
  }
}

~/.codex/config.toml

[mcp_servers.mu]
url = "https://micro.mu/mcp"

.cursor/mcp.json

{
  "mcpServers": {
    "mu": {
      "url": "https://micro.mu/mcp"
    }
  }
}

.vscode/mcp.json

{
  "mcpServers": {
    "mu": {
      "url": "https://micro.mu/mcp"
    }
  }
}

Available tools 148

Read directly from the server with tools/list, grouped by what they act on. If a tool disappears, we record the date.

apps

apps_build

Queue a durable app build and immediately return its ID and status URL. Use BuildStatus to retrieve progress and the completed app. Reuse request_key on retries. Builds survive server restarts

apps_buildstatus

Read your saved app build status by ID. Poll until complete or failed; the same ID survives restarts.

apps_create

Create an app — a small, self-contained HTML tool hosted here. Takes the HTML; apps_build writes it for you from a description

apps_edit

Edit an app you own — its name, description, tags, icon, HTML or price. Fields left out keep their value

apps_embed

Get the HTML that puts an app on another page — an iframe tag pointing at the app, which runs there sandboxed the same way it runs here. Apps that charge cannot be embedded, and an app that calls mu. only reaches this instance from a page on it

apps_fork

Fork an app into your own account, to change independently of the original

apps_read

Read the details of one app by its slug

apps_search

Search the apps directory for small, useful tools, by name, description or tag

apps_test

Test an app by checking its HTML and running its mu.api calls server-side, so an author finds out what is broken without opening it

images

images_daily

Retrieve the current daily image or a date

images_delete

Delete an image you own

images_generate

Generate an image from a text prompt and return its URL

images_get

Retrieve accessible image metadata and URL

images_list

List stored images or the daily archive with pagination

images_search

Search accessible stored images by title, description, prompt and tags; public by default

images_share

Explicitly publish or unpublish your image

images_update

Edit metadata on an image you own

images_upload

Upload a private raster image

mail

mail_gmailread

Read the caller's connected Gmail. Read-only; connect in Account first.

mail_gmailsearch

Search the caller's connected Gmail. Read-only; connect in Account first.

mail_inbox

List the account's most recent messages — read my mail, check my inbox

mail_info

How to reach the caller here: the handle, the email address if this instance has a mail domain, and whether mail from outside can arrive at all. Pass a tag for a separate one (you+tag) — give that out, then read only its messages with mail_inbox(tag)

mail_markread

Mark specified inbox message IDs, or explicitly all current inbox messages, as read. Changes read status only; does not read, summarize or triage the content.

mail_read

Read your correspondence by id in bounded body-character pages, including attachment names. Follow the returned next offset for the rest. Omitting id retains the legacy inbox summary

mail_search

Search the account's mail and return matching messages

mail_send

Write to somebody, as you. A username reaches them on this instance and is free; a full email address leaves over SMTP under this instance's domain, so a reply comes back to your inbox, and is charged. Resolve a name with contacts_find first. Mail that leaves needs MAIL_DOMAIN configured on the instance

files

files_delete

Delete a file you own

files_driveread

Read the caller's connected Google Drive. Read-only; connect in Account first.

files_drivesearch

Search the caller's connected Google Drive. Read-only; connect in Account first.

files_get

Read a stored file back by its id

files_list

List the caller's stored files, newest first

files_put

Store a file and get a URL for it — a report, a CSV, a transcript

files_share

Make a file readable by anyone with its URL, or private again

prayer

prayer_qibla

Get the qibla — the compass bearing to face for Islamic prayer from a location

prayer_reflection

Get today's Islamic reflection — a verse of the Quran with its surah, a saying of the Prophet, and a name of Allah

prayer_saying

Look up a hadith from Sahih al-Bukhari, optionally from a given book

prayer_search

Search the Quran, the hadith and the names of Allah by meaning — ask a question in plain language rather than naming a reference

prayer_times

Get today's Islamic prayer times (salah) for a location, and which prayer is next

prayer_verse

Look up a chapter of the Quran, or one verse within it, by number. Use prayer_search to ask a question instead of naming a reference

transit

transit_arrivals

What is due at a stop and when. Takes a stop name or an id. In London this is live from TfL — buses, tube, DLR, Overground and Elizabeth line. Elsewhere it is the published timetable, and says so

transit_buses

Where the buses actually are near a point right now — line, where each is heading and how far away, nearest first. England, from the Bus Open Data Service. This is position rather than prediction: it says what is moving, not when it reaches you

transit_feeds

Which published timetables this instance carries, and which others it could — with the size of each, so an operator can see what switching one on costs. Also names the feeds that look right but whose timetables have run out

transit_nearby

Bus stops and stations near a point, nearest first, with the id each one is called by. London live from TfL; elsewhere from whichever published timetables this instance has loaded

transit_status

Which lines are delayed, part-suspended or closed right now, and why. London only

transit_trains

The live departure or arrival board at a British station, by its three-letter code — KGX, MAN, EDB. Scheduled and expected time, platform, operator and where it is going, plus any disruption notice. From National Rail

blog

blog_create

Publish a post to the caller's blog. For anything meant to be read later by other people — notes, write-ups, announcements. For a private note to yourself, prefer files or memory

blog_delete

Delete one of the caller's own blog posts, by id or title. Refuses posts written by anyone else, and refuses an ambiguous title rather than guessing. Irreversible, so confirm with the user first

blog_list

Read recent blog posts — titles, snippets and ids

blog_read

Read one blog post in full, by id or by title. Use after blog_list has found a candidate and the summary is not enough

blog_update

Edit one of the caller's own posts. Fields left out keep their current value

bookmarks

bookmarks_add

Save an article, video, blog post or link privately. Re-saving preserves its note

bookmarks_annotate

Set or clear a private note on one saved item

bookmarks_delete

Remove one of your saved items

bookmarks_get

Read one saved item and its private note, with available archived text. Videos have descriptions, not transcripts

bookmarks_list

Find your saved reading by text or kind, newest first. Private notes are searched too

events

events_create

Schedule a reminder or event at a given time; optionally repeating, and optionally running a prompt through the agent when it fires

events_delete

Cancel an event by id

events_free

Find when the caller has nothing booked — open slots of a given length, within working hours

events_list

List the caller's upcoming events and reminders, each with its id

events_update

Update one of your scheduled events without changing its id. Omitted fields stay unchanged; empty notes, prompts or recurrence clear them

places

places_address

Name the place at a latitude and longitude — the reverse of places_geocode. Use it whenever you have coordinates and need to say where that is

places_elevation

How high a place is above sea level, in metres and feet. Sampled from a 90-metre global elevation model, so a summit reads a little under its surveyed height

places_geocode

Resolve a place name or address to coordinates

places_nearby

List points of interest near a location. Each one says whether it is open right now where that is known, so "is anything open near me" is one call

places_search

Find places by name or category, optionally near a location. Each one says whether it is open right now where that is known, rather than raw opening-hours text to interpret

tasks

tasks_create

Add a task. Assign it to the agent and it can pick the task up itself

tasks_delete

Remove a task

tasks_list

List the caller's tasks, open ones first; optionally filtered by state

tasks_next

The next task assigned to the agent — what to work on now

tasks_update

Change a task: its state, or the result of doing it

weather

weather_air

Air quality at a location right now — AQI, PM2.5, PM10, ozone, nitrogen dioxide, UV index, and pollen where it is counted

weather_forecast

Get the weather forecast for a location — current conditions, the days ahead, and today's sunrise, sunset and how much daylight is left, which is the fact that decides an afternoon outdoors

weather_history

What the weather actually was at a location between two dates — average high and low, total rainfall and the extremes. Records run a few days behind today

weather_lookup

Look up the weather by town or city name

weather_marine

Sea state at a coastal or offshore point — wave height, period and direction now and for the days ahead, with sea temperature

contacts

contacts_add

Save someone to the address book. Adding a name already there updates it rather than making a second card

contacts_delete

Remove someone from the address book

contacts_find

Look someone up in the address book by name, part of a name, or address. Use this before sending mail to a person named rather than addressed

contacts_list

List everyone in the caller's address book

docs

docs_delete

Delete one of your documents, by id

docs_list

List your documents, most recently changed first, with an optional search over titles and bodies. Use this to find an id

docs_read

Read one of your documents in full, by id or by exact title

docs_write

Write a document — a title and a markdown body. Pass an id to replace one you already have. Private unless you set public. For something long enough to re-read; for a short thing to remember, use notes

flights

flights_airport

Report what is happening at an airport right now: what is on the ground, what is on approach and what is climbing out. Live positions, not the timetable, so it says nothing about scheduled or delayed departures

flights_overhead

List the aircraft flying near a location right now, nearest first, with altitude, speed, heading and distance. Live positions broadcast by the aircraft themselves, not a schedule

flights_status

Scheduled, estimated and actual flight arrival/departure times from Aviationstack. Requires a configured provider.

flights_track

Find where an aircraft is right now by flight number ('BA117'), radio callsign ('BAW117') or registration ('G-ZBKL'). Only sees aeroplanes that are airborne and in range of a receiver — not finding one does not mean the flight was cancelled

markets

markets_convert

Convert an amount from one currency to another — 250 GBP in JPY. Uses European Central Bank reference rates, and takes a past date back to 1999. Crypto converts at the live price through the dollar

markets_history

Read daily closing prices for a supported instrument over a range of up to 366 days. Missing trading days are omitted. Uses Yahoo Finance

markets_list

Get live prices for cryptocurrencies, stocks, commodities (oil, gold, silver, copper and crops), futures and currencies

markets_quote

Read one supported instrument price in USD, with source, timestamp and staleness

news

news_headlines

Read the home card headlines: latest story per topic, freshest first, at most ten

news_list

Read recent news headlines with short summaries, balanced across topics

news_read

Read one news article in full by its id or URL

news_search

Search indexed and live news for a topic

notes

notes_add

Write a note under a title, so it is there next conversation. Writing a title that exists rewrites that note

notes_delete

Delete one note by title

notes_get

Read one note by title. Use it when you know the title; notes_list when you do not

notes_list

List every note the caller has written, with its text

sms

sms_history

Read the texts this account has sent and received, newest first. Both directions, which is why it is not called an inbox

sms_number

The number texts are sent from, which numbers are verified as yours, and how many messages are left today

sms_send

Message somebody from this instance's number, by text or on WhatsApp. A text is charged per 160-character segment; WhatsApp is charged per 24-hour conversation and only reaches somebody who wrote in within the last day. Capped per day either way, and the recipient can stop it with STOP

sms_verify

Claim a number as your own, so texts arriving from it reach this account. Call it with just the number to have a code texted there, then again with the code

text

text_classify

Sort text into one of the labels you give, with a confidence. For routing, triage and moderation. Capped at 30,000 characters

text_extract

Turn text into JSON matching a schema you give. Pass the fields you want as a JSON schema or a plain description; returns JSON only. Capped at 30,000 characters

text_summarise

Summarise text into a few sentences. Pass style=bullets for a list, or a sentence count. Capped at 30,000 characters

text_translate

Translate text into another language, preserving formatting. Capped at 30,000 characters

chat

chat_messages

Read the recent conversation in a discussion room

chat_rooms

List discussion rooms that currently have activity

chat_send

Say something in a discussion room, as the caller. Use chat_rooms to find the room id

food

food_hygiene

Food hygiene ratings for UK businesses, from the Food Standards Agency inspections. Takes a business name, a town or postcode, or a lat/lon to look around

food_product

Look up a packaged food by its barcode — name, brand, ingredients, allergens, nutrition per 100g, Nutri-Score and how processed it is

food_search

Find packaged foods by name or brand, with the barcode of each so one can then be looked up in full

hazards

hazards_alerts

Current disasters worldwide from GDACS — cyclones, floods, volcanoes, wildfires and earthquakes — with an alert level of green, orange or red. Pass lat/lon to ask about somewhere in particular

hazards_floods

Flood warnings and alerts in force in England, most severe first, from the Environment Agency. The one hazard here that is a forecast rather than a record — a warning says flooding is expected, which is something you can act on. Optionally near a point. England only, and the answer says so

hazards_quakes

Recent earthquakes worldwide from the USGS, with magnitude, place and how long ago. Pass lat/lon to ask about somewhere in particular, min for a magnitude floor, and period for hour, day, week or month

recall

recall_conversation

Read one whole conversation back by id, as recall_search and recall_list report it

recall_list

List the caller's conversations, most recently active first, with what each is about and where it happened

recall_search

Search everything the caller has said to an agent and been told, wherever they said it — the browser, email, or the command line. Use it when something was mentioned and you need to find where; notes_get is for a fact somebody wrote down on purpose

routes

routes_directions

The turn-by-turn route between two places, with the distance for each instruction. Use ETA instead when only the travel time is wanted — this asks the provider for more and costs more

routes_eta

How long it takes to travel between two places, by road rather than as the crow flies. Can be asked about a future departure, or told when you need to arrive and answer when to leave

routes_nearest

Given a starting point and several destinations, say which is quickest to reach and put them in order. Each destination is a separate routing lookup, so ask about the places you are actually choosing between rather than a long list

users

users_find

Look somebody up by username or display name. Use this to turn a name somebody mentioned into an address you can write to

users_get

One user, by username

users_list

Everyone on this instance, online first and then newest. Agents are included and marked; an agent account is a user here like any other

video

video_list

Read the latest videos from curated channels

video_read

Read the metadata and description of one video already discovered by this instance. No transcript is available

video_search

Search YouTube by keyword using this instance's search quota. Results are not restricted to the curated channels

web

web_fetch

Fetch a web page by URL and return its cleaned readable content, stripping ads, popups and navigation. Needs an account

web_images

Search the web for images, thumbnails and original source pages

web_search

Search the web for current information and news

Tools removed

Tools this server used to expose. Anything built against them stopped working on the day they went.

islam_prayer

removed 4 Aug 2026

islam_qibla

removed 4 Aug 2026

islam_today

removed 4 Aug 2026

agent

removed 7 Aug 2026

chat

removed 7 Aug 2026

dismiss

removed 7 Aug 2026

flag

removed 7 Aug 2026

hadith

removed 7 Aug 2026

quran

removed 7 Aug 2026

save

removed 7 Aug 2026

unsave

removed 7 Aug 2026

chat_ask

removed 7 Aug 2026

context_get

removed 8 Aug 2026

block_user

removed 10 Aug 2026

content_flag

removed 10 Aug 2026

content_hide

removed 10 Aug 2026

content_save

removed 10 Aug 2026

content_unsave

removed 10 Aug 2026

index_search

removed 10 Aug 2026

quran_search

removed 10 Aug 2026

unblock_user

removed 10 Aug 2026

wallet_charge

removed 10 Aug 2026

wallet_check

removed 10 Aug 2026

memory_delete

removed 10 Aug 2026

memory_list

removed 10 Aug 2026

memory_set

removed 10 Aug 2026

cache_delete

removed 11 Aug 2026

cache_get

removed 11 Aug 2026

cache_list

removed 11 Aug 2026

cache_set

removed 11 Aug 2026

db_create

removed 11 Aug 2026

db_delete

removed 11 Aug 2026

db_get

removed 11 Aug 2026

db_list

removed 11 Aug 2026

docs_create

removed 12 Aug 2026

docs_get

removed 12 Aug 2026

places_eta

removed 12 Aug 2026

mail_address

removed 13 Aug 2026

mail_email

removed 13 Aug 2026

user_block

removed 17 Aug 2026

user_flag

removed 17 Aug 2026

user_hide

removed 17 Aug 2026

user_save

removed 17 Aug 2026

user_saved

removed 17 Aug 2026

user_unblock

removed 17 Aug 2026

user_unsave

removed 17 Aug 2026

email_history

removed 21 Aug 2026

email_send

removed 21 Aug 2026

email_sender

removed 21 Aug 2026

email_verify

removed 21 Aug 2026

whatsapp_history

removed 21 Aug 2026

whatsapp_open

removed 21 Aug 2026

whatsapp_send

removed 21 Aug 2026

stream_post

removed 21 Aug 2026

apps_run

removed 23 Aug 2026

tiles_area

removed 23 Aug 2026

tiles_tile

removed 23 Aug 2026

sandbox_list

removed 24 Aug 2026

sandbox_read

removed 24 Aug 2026

sandbox_run

removed 24 Aug 2026

sandbox_write

removed 24 Aug 2026

wallet_list

removed 26 Aug 2026

wallet_pay

removed 26 Aug 2026

apps_publish

removed 28 Aug 2026

shell_list

removed 28 Aug 2026

shell_read

removed 28 Aug 2026

shell_replace

removed 28 Aug 2026

saved_add

removed 7 Sep 2026

saved_annotate

removed 7 Sep 2026

saved_delete

removed 7 Sep 2026

saved_get

removed 7 Sep 2026

saved_list

removed 7 Sep 2026

images_websearch

removed 12 Sep 2026

agent_ask

removed 20 Sep 2026

agent_list

removed 20 Sep 2026

inbox_list

removed 20 Sep 2026

inbox_mark_read

removed 20 Sep 2026

inbox_mark_unread

removed 20 Sep 2026

inbox_read

removed 20 Sep 2026

work_get

removed 20 Sep 2026

work_list

removed 20 Sep 2026

work_retry

removed 20 Sep 2026

work_submit

removed 20 Sep 2026

Endpoints

URL	Transport	State	Latency	Checked
https://micro.mu/mcp	streamable-http	answering	441 ms	13 min ago

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Mu — questions

Answers built from our own checks of this server.

What can Mu do?

It exposes 148 tools, read directly from the server on our last check. Among them: apps_build, apps_buildstatus, apps_create, apps_edit, apps_embed, apps_fork and 142 more. The full list with descriptions is on this page — we take it from the server itself via tools/list, not from a README. How MCP servers expose tools in the first place →

What is Mu mostly used for?

Its tools cluster around images, apps and mail. That is what this server is built to work with — the grouping comes from the actual tool names, not from a category we assigned.

Is Mu working right now?

We send a real MCP handshake every 15 minutes. Over the last 24 hours 90 of 90 checks got a reply (100.0%), average response time 209 ms. The bar chart above shows every period we have measured.

Did Mu ever remove tools?

Yes. islam_prayer, islam_qibla, islam_today, agent and 79 more are no longer exposed — we recorded the date each one disappeared. A tool vanishing usually means a breaking change for anything that depended on it.

How do I connect Mu?

Copy the ready config from this page — we generate it for Claude Code, Claude Desktop, Codex, Cursor and VS Code, each with the file path that client actually reads. It is a remote server, so there is nothing to install — the client connects to the address.

Does Mu need an API key?

No. Mu completed a full MCP handshake with us as an anonymous client and listed its tools without asking for anything. All 148 of them are readable on this page. This is what we observed, not what the docs claim.

How fast is Mu?

It answers our handshake in 209 ms on average, which is faster than 68% of all working MCP servers we measure. The comparison comes from our own checks across the whole registry, every 15 minutes.

Is Mu open source?

Yes — it is published under the AGPL-3.0 licence, written in Go, 434 stars on GitHub and 60 open issues. The source link is on this page, so you can read exactly what it does with your data before you connect it.