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call_tool

Execute a discovered tool by name and arguments, enabling direct invocation of specific functions from the MCP server.

Instructions

Call a tool by name with the given arguments.

Use this to execute tools discovered via search_tools.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
nameYesThe name of the tool to call
argumentsNo
Behavior2/5

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

No annotations are provided, and the description does not mention potential side effects, required permissions, or the fact that this tool may execute arbitrary actions. This lack of transparency is risky for an agent.

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 with no redundant information. The description is efficient and to the point.

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?

The description explains the basic purpose and links to search_tools, but it lacks details on error handling, return values, or behavioral constraints. Given the tool's generic nature, this is acceptable but not comprehensive.

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

Parameters2/5

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

Only the 'name' parameter has a description in the schema; 'arguments' is not described. The description adds minimal value by implying arguments are passed, but does not clarify structure or constraints, leaving significant ambiguity.

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 the action (call a tool) and the target (by name with arguments), and it is distinct from the sibling tools which perform specific operations like remember or recall.

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?

It explicitly says to use this for executing tools discovered via search_tools, giving a clear use case. It does not elaborate on when not to use it, but the guidance is sufficient for typical scenarios.

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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