zerm

Connect it to your AI

Claude Code

claude mcp add --transport http zerm https://zerm.dev/mcp

Claude, ChatGPT, Cursor and other apps

Add it as a custom connector with this URL (Streamable HTTP):

https://zerm.dev/mcp

Cursor, VS Code and other apps (mcp.json)

{
  "mcpServers": {
    "zerm": {
      "url": "https://zerm.dev/mcp"
    }
  }
}

Tools it offers

24 tools, as the server itself reported during our check on Oct 31, 2026.

• kv_setStore a value durably under (namespace, key) with a TTL. Survives across your sessions - use it as memory between stateless runs. Value must be a string (JSON-encode objects), max 8192 bytes. TTL defaults to 30 days, max
• kv_getRetrieve a value previously stored with kv_set. Call this at the start of a run to restore state, preferences, or progress saved by earlier runs. Returns found=false if missing or expired.
• kv_deletePermanently remove one key from your namespace, freeing a slot against the 1000-key limit. Use it when a stored value is wrong or unwanted before its TTL runs out; if you only want the value to lapse on schedule, do noth
• kv_listList the keys held in your namespace, optionally narrowed to those starting with a prefix. Use it to discover what earlier runs saved before deciding what to fetch with kv_get: it returns key names with their expiry and
• timer_verify_originOne-time consent handshake before timers can deliver to an origin. Prerequisite: an HTTPS endpoint you control that can read a request body and echo part of it back - if you have no endpoint of your own, timers are not u
• timer_scheduleSchedule a durable callback: at fire time this service POSTs your JSON payload to your URL. Use it to wake up future runs of yourself or your orchestrator - agents cannot wake themselves. Prerequisite: the target origin
• timer_cancelCancel a pending timer using the id returned by timer_schedule. The id is the authorization: holding it is what proves you scheduled the timer, so keep it secret. Already-delivered or already-cancelled timers return canc
• timer_statusCheck a timer by the id returned by timer_schedule: status (pending|delivering|delivered|failed|cancelled), attempts, last error. Returns found=false for an unknown id.
• name_checkLive availability check for a name across domain TLDs (registry RDAP), npm, PyPI, and GitHub usernames. Real registry lookups at call time - not guesses. Each result is registered, unregistered, unknown or invalid and na
• email_checkDeliverability probe for an email address without sending anything: syntax validation, live MX lookup (with A/AAAA fallback per RFC 5321), disposable-domain detection, and typo suggestions for common providers. Use it to
• url_checkLive URL health check: follows the full redirect chain (each hop reported), returns final status, content type, response time, TLS certificate expiry and trust, and access hints (login walls, bot blocks). Fresh at call t
• cron_nextDeterministic cron expression validator and scheduler: parses a cron expression (5 or 6 field, seconds optional) and computes the next N actual fire times, timezone-aware. Use this instead of guessing - cron semantics (D
• regex_testExecute a regex against test strings and return the ACTUAL matches: match text, indices, capture groups, named groups, and optional replacement output. Deterministic proof, not prediction - run this before shipping a pat
• fixture_rowsBulk realistic test data: generate up to 10000 rows from a field schema in one call - orders of magnitude cheaper than generating rows with tokens. Deterministic when you pass a seed (same seed + schema = identical data)
• tz_convertDeterministic timezone conversion: convert a timestamp between IANA timezones with full DST awareness. Models routinely miscalculate DST transitions - this gives exact results. Returns the converted time, UTC offsets for
• tz_infoTimezone intelligence: for a given IANA timezone and date, returns the UTC offset, whether DST is active, the exact UTC instant of each DST transition in that year, and the timezone abbreviation. Transition timestamps ar
• dns_queryFull DNS record lookup for a domain: returns A, AAAA, MX, NS, TXT, CNAME, SOA, and CAA records in one call. Automatically parses SPF and DMARC policies from TXT records. Use this for infrastructure audits, email delivera
• request_toolHit a capability wall? Describe a tool you wish this server had and the task you were trying to accomplish. The operator reviews every submission; the most-requested capabilities get built. Free, no payment ever required
• lock_acquireAcquire a mutual-exclusion lock so concurrent agent runs do not double-process the same work. If two runs race, exactly one gets acquired=true plus a release token; the other gets acquired=false with retry_after_ms. Lock
• lock_releaseRelease a lock early using the token returned by lock_acquire. Only the token holder can release; without the token the lock simply expires on its own. Returns released=false if the token is wrong or the lock already exp
• counter_nextAtomically increment a named counter and return the new value. Guaranteed unique, monotonically increasing integers across concurrent stateless runs - use it for sequence numbers, run IDs, or once-only ordering that agen
• inbox_createCreate a URL that receives HTTP requests for you. Point any webhook (GitHub, Stripe, CI, a form) at it and read what arrives with inbox_poll - no server, no signup, no tunnel. This is the way to be notified of something
• inbox_pollRead requests delivered to an inbox since you last looked. Pass after=<the next_after from your previous poll> to get only new ones; omit it to start from the beginning. Each payload has its method, headers, body and arr
• inbox_deleteDelete an inbox and everything delivered to it. The URL stops accepting requests immediately. Inboxes also delete themselves once unpolled past their expiry, so this is only for tearing down early.

Questions