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nemanjavlahovic

InstrumentsMCP

stop_profiling

End an active profiling session, parse the trace, and return structured performance data for analysis.

Instructions

Stop an active recording started by start_profiling. Sends SIGINT to xctrace, waits for the trace to be saved, then parses and returns structured results. Returns the same parsed performance data as the profile_* tools.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault

No arguments

Behavior4/5

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

With no annotations, the description fully covers behavior: sends SIGINT, waits for save, parses, and returns structured results. It also clarifies the output equivalence to profile_* tools, though it could mention potential errors or resource cleanup.

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?

Three sentences with no fluff: first sentence states purpose, second explains process, third details output. Front-loaded and efficient.

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?

Given lack of output schema and annotations, the description adequately explains the action, process, and expected return value. It could mention prerequisites or error conditions, but overall is sufficient.

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 coverage is 100% (no parameters), so the baseline of 3 applies. The description does not add parameter information but none is needed.

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 ('stop an active recording') and identifies the specific resource ('started by start_profiling'), distinguishing it from sibling tools like start_profiling and profile_* tools.

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?

The description implies usage after start_profiling and notes that output matches profile_* tools, providing context for when to use. However, it does not explicitly state when not to use or list 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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