mcp-fabric-api

eventstream_update_definition

Update an eventstream definition by reading definition files from a directory. Provide workspace and eventstream IDs plus directory path to apply changes.

Instructions

Update the definition of an eventstream (long-running). Reads definition files from the specified directory.

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": {
      "workspaceId": "<workspaceId>",
      "eventstreamId": "<eventstreamId>",
      "definitionDirectoryPath": "<definitionDirectoryPath>"
    },
    "name": "eventstream_update_definition"
  }
}

Input Schema

Name	Required	Description
`workspaceId`	Yes	The workspace ID
`eventstreamId`	Yes	The eventstream ID
`definitionDirectoryPath`	Yes	Path to a directory containing eventstream definition files

Schema Changelog

Changes observed during successful MCP inspections.

First observedv2.8.0Sep 6, 2026

TDQS

A4/5.0

Behavior4/5

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

Annotations already indicate this is not read-only and not destructive. The description adds useful behavioral context by noting the operation is long-running and that it reads definition files from a directory, which signals an asynchronous, file-driven update process.

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?

Two concise sentences deliver the core purpose first, flag the long-running behavior, and state the input mechanism. There is no redundant or filler content.

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

Completeness4/5

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

For a tool with fully documented parameters and clear annotations, the description covers the main operational facts: what it updates, how it updates it, and that it is long-running. It does not mention how to track the operation's result or status, but the provided details are sufficient for correct invocation.

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

Parameters3/5

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

The input schema already documents all three parameters with 100% coverage. The description adds only marginal context by confirming definitionDirectoryPath is where definition files are read from; it does not explain file format or directory structure expectations.

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 states a specific verb ('Update'), a specific resource ('definition of an eventstream'), and the mechanism ('Reads definition files from the specified directory'). This clearly distinguishes it from sibling tools like eventstream_update and eventstream_get_definition.

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

Usage Guidelines3/5

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

The description implies when to use this tool: when an eventstream definition needs to be updated from a directory of definition files. However, it does not explicitly name alternatives or state when not to use it, leaving some routing to inference.

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

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