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call

Invoke any tool on a specified MCP server. Provide tool name, optional server ID, and arguments to execute remote functions.

Instructions

Call a tool on an MCP server. server_id optional when shapeshifted — current form used. After shapeshift(): call('list_directory', arguments={'path': '/tmp'}) Direct: call('list_directory', '@some-server', {'path': '/tmp'})

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
tool_nameYes
server_idNo
argumentsNo
configNo

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior2/5

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

No annotations exist, so the description carries full burden. It only mentions server_id optionality and provides examples, but fails to disclose error handling, idempotency, or other behavioral traits.

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?

The description is short and front-loaded with the purpose, followed by concise examples. No unnecessary words.

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

Completeness2/5

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 is too minimal. It lacks details on behavior, errors, and parameter usage for a tool that invokes other tools, leaving gaps for the agent.

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?

Schema description coverage is 0%, so description must compensate. It implies tool_name and server_id, shows arguments in example, but ignores the config parameter entirely.

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?

The description clearly states the verb 'call a tool on an MCP server' and provides examples, distinguishing it from sibling tools like auth or search. However, it could be more explicit about what 'calling a tool' entails.

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 gives context for when to omit server_id (after shapeshift) and includes example calls, but lacks explicit when-not-to-use guidance or mention of alternatives.

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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