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Call a connected integration

gateway_call

Call a tool on an external integration the user has connected to their workspace (for example GitHub or Jira). Only integrations explicitly enabled by the user in their MMW workspace are accessible. The user's credentials are never shared with the AI model.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
toolYesName of the specific action to perform on the integration (e.g. 'get_file_contents').
serverYesName of the integration to call (e.g. 'github_readonly'). Must be an integration the user has enabled.
argumentsYesParameters to pass to the integration action.
project_idNoOptional project ID to scope this call. Defaults to the user's default project.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultNoDownstream tool execution result payload

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed4 schema fields changed
    • changedInput schema / properties / arguments / description
      Previous value: -"Key-value dictionary containing the input parameters expected by the downstream tool. Must conform to that tool's input schema."New value: +"Parameters to pass to the integration action."
    • changedInput schema / properties / project_id / description
      Previous value: -"Optional isolated project context ID. When omitted, automatically resolves to the default project for the authenticated tenant."New value: +"Optional project ID to scope this call. Defaults to the user's default project."
    • changedInput schema / properties / server / description
      Previous value: -"Unique identifier of the downstream MCP service (e.g. 'github_readonly'). Must match an active registered gateway service."New value: +"Name of the integration to call (e.g. 'github_readonly'). Must be an integration the user has enabled."
    • changedInput schema / properties / tool / description
      Previous value: -"Exact name of the tool to execute on the downstream server (e.g. 'pull_request_read' or 'get_file_contents')."New value: +"Name of the specific action to perform on the integration (e.g. 'get_file_contents')."
  2. First observed

TDQS

B3.2/5.0
Behavior3/5

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

Annotations already declare openWorldHint=true, readOnlyHint=false, idempotentHint=false and destructiveHint=false, so the safety profile is partly covered. The description usefully adds that only explicitly enabled integrations are reachable and that credentials are never exposed to the model. It omits, however, that the real effect depends entirely on the target tool, and gives no hint about auth failures or rate limits on external services.

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

Conciseness4/5

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

Three short sentences, front-loaded with the core action and followed by the two real constraints. No filler or repetition of the title/annotations, though nothing is used to route the agent toward the right integration.

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

Completeness3/5

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

Because an output schema exists, return values need not be explained, and the schema documents all four parameters. What is missing for a generic proxy with nested arguments is any mention of how the agent discovers available servers/tools or how this relates to the concrete sibling integration tools, leaving an important operational gap.

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?

Schema description coverage is 100%, so server, tool, arguments and project_id are already documented in the schema, which sets the baseline at 3. The description reinforces the 'must be enabled' constraint on server but adds no format or naming detail beyond what the schema provides.

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

Purpose4/5

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

States a specific verb and resource: call a tool on an external integration, with GitHub/Jira as concrete examples. However, it does not distinguish itself from the concrete sibling tools (github_readonly.get_file_contents, github_readonly.get_me), leaving it ambiguous whether an agent should route through the gateway or call the direct tool when both appear available.

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

Usage Guidelines2/5

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

The description contains no when-to-use or when-not-to-use guidance and never names an alternative. The statement that only user-enabled integrations are accessible is a constraint, not routing advice, so the agent must infer when the gateway is the right path versus a direct sibling tool.

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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