zulip-mcp

list_topics

Retrieve recent topics in a stream to discover conversation threads before fetching messages. Each topic includes its name and last message ID.

Instructions

List topics (threads) in a stream, most recent first.

Use this to discover what conversations exist in a stream before fetching messages. Each topic is like a thread/subject line.

Args: stream_id: The numeric ID of the stream. Use get_stream_id to look this up.

Returns: JSON list of topics with names and last message IDs.

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "stream_id": "<stream_id>"
    },
    "name": "list_topics"
  }
}

Input Schema

Name	Required	Description	Default
`stream_id`	Yes

Output Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Jul 10, 2026

TDQS

A4.5/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

No annotations are provided, so the description bears full responsibility. It discloses the output format (JSON list of topics with names and last message IDs) and sorting order (most recent first). It does not mention edge cases like empty lists or permissions, but for a read-only list tool it is sufficient.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is concise with no superfluous words. It front-loads the purpose, then gives usage guidance, parameter details, and return format in a logical order.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

Despite having an output schema, the description still explains the return format. With only one required parameter and clear documentation, it is fully complete for a simple list tool.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema description coverage is 0%, so the description compensates by explaining the stream_id parameter as 'The numeric ID of the stream' and references get_stream_id for lookup. This adds meaning beyond the schema.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states it lists topics (threads) in a stream, most recent first. It differentiates from sibling tools like get_message and get_messages by stating it discovers conversations before fetching messages.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines4/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicitly says 'Use this to discover what conversations exist in a stream before fetching messages.' Provides clear context for when to use it, though no exclusions are mentioned.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

Deploy Server