// SCAN REPORT

Zulip MCP Server

8 tools. 4 can modify or destroy data without limits.

4 write tools that can modify data. Rate limits recommended.

Last updated: 12 Jun 2026

4 can modify or destroy data

4 read-only

8 tools total

Community server · catalogue entry verified 12/06/2026

How to control Zulip MCP Server ↓

TOOL MAP

What Zulip MCP Server exposes to your agents

Read (4) Write / Execute (4) Destructive / Financial (0)

Running more than one server? Check your whole stack →

MOST DANGEROUS TOOLS

High Risk

The most dangerous Zulip MCP Server tools

Write · Low zulip_add_reaction Adding a reaction modifies the message's metadata by appending a new reaction entry, but this is easily reversible (the reaction can be removed). Write · Medium zulip_post_message This tool creates new data (a message) in a reversible manner—messages can be edited or deleted afterward by users with appropriate permissions. Write · Medium zulip_send_direct_message This tool creates/writes new data (direct messages) that is reversible (messages can be deleted or edited later). Write · Low zulip_subscribe_to_channel Subscribing to a channel is a reversible write action — it adds the bot as a member of a stream.

4 of Zulip MCP Server's 8 tools can modify, destroy, or commit something on every call — and an agent calls them with no built-in limits.

POLICY

How to control Zulip MCP Server

PolicyLayer is an MCP gateway — it sits between your AI agents and Zulip MCP Server, and nothing reaches the server without passing your rules. These are the rules we recommend:

Rate limit write operations

{
  "zulip_subscribe_to_channel": {
    "limits": [
      {
        "counter": "zulip_subscribe_to_channel_per_hour",
        "window": "hour",
        "max": 30,
        "scope": "grant"
      }
    ]
  }
}

Prevents bulk unintended modifications from agents caught in loops.

Cap read operations

{
  "zulip_get_channel_history": {
    "limits": [
      {
        "counter": "zulip_get_channel_history_per_minute",
        "window": "minute",
        "max": 60,
        "scope": "grant"
      }
    ]
  }
}

Controls API costs and prevents retry loops from exhausting upstream rate limits.

Create a free account and register Zulip MCP Server — nothing to install.
Add these rules — paste them, or build them visually. Tune the limits to your setup.
Point your MCP client (Claude, Cursor, anything) at your gateway URL.

ENFORCE POLICY ON ZULIP →

Free to start. No card required.

FULL CATALOGUE

All 8 Zulip MCP Server tools

WRITE 4 tools

Write zulip_subscribe_to_channel Subscribe the bot to a channel (stream) Write zulip_add_reaction Add an emoji reaction to a message Write zulip_post_message Post a new message to a Zulip channel (stream) Write zulip_send_direct_message Send a direct message to one or more users

READ 4 tools

Read zulip_get_channel_history Get recent messages from a channel (stream) and topic Read zulip_get_topics Get topics in a channel (stream) Read zulip_get_users Get list of users in the Zulip organization Read zulip_list_channels List available channels (streams) in the Zulip organization

FAQ

Questions about Zulip MCP Server

How do I prevent bulk modifications through Zulip MCP Server? +

The Zulip MCP Server server has 4 write tools including zulip_subscribe_to_channel, zulip_add_reaction, zulip_post_message. Set a rate limit in your policy -- for example, 10 calls per hour prevents an agent from making more than 10 modifications per hour. PolicyLayer enforces this at the gateway, before calls reach Zulip MCP Server.

How many tools does the Zulip MCP Server MCP server expose? +

8 tools across 2 categories: Read, Write. 4 are read-only. 4 can modify, create, or delete data.

How do I enforce a policy on Zulip MCP Server? +

Register the Zulip MCP Server MCP server in PolicyLayer, apply the suggested rules above (adjust the limits to your use case), and point your AI client at the PolicyLayer proxy URL instead of the server directly. Your agents keep the same tools; PolicyLayer evaluates every call against policy before it executes. Nothing to install, live in minutes.

Enforce policy on every Zulip MCP Server tool call.

Deterministic rules across all 8 Zulip MCP Server tools. Per-identity grants. Full audit log. Live in minutes. Nothing to install.

ENFORCE POLICY ON ZULIP →

Free to start. No card required.

8 Zulip MCP Server tools catalogued and risk-classified — across an index of 43,000+ MCP servers.