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ios-instruments-mcp

analyze_leaks

Identify and diagnose memory leaks in iOS apps by recording a Leaks trace, with automatic retain cycle detection and suggested fixes.

Instructions

Record a Leaks trace and report all memory leaks with retain cycle detection and fix suggestions.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
bundle_idYesApp bundle ID, e.g. com.mycompany.myapp
device_idYesSimulator UUID or physical device ID. Use list_devices to find it.
time_limit_secondsNoRecording duration in seconds (default 20s).
Behavior3/5

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

The description discloses that the tool records a trace and reports leaks, implying data collection without modification. However, with no annotations, it does not explicitly state if the recording is invasive or whether fix suggestions are applied, leaving some behavioral ambiguity.

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 a single, concise sentence that conveys the core functionality without extraneous details. It could be slightly more structured but is efficient.

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?

The description does not mention the output format or what the report looks like, and there is no output schema. Given 3 parameters and no output schema, the description should clarify the return value and postconditions for completeness.

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 provides full coverage of all three parameters with clear descriptions. The tool description adds no additional meaning beyond what the schema already 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?

The description clearly states the tool records a Leaks trace and reports memory leaks with detect and fix suggestions. However, it does not distinguish from sibling tool 'analyze_leaks_trace', which may have a different purpose.

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?

No guidance is provided on when to use this tool versus siblings like 'analyze_leaks_trace' or under what conditions. The description implies usage for leak detection but lacks explicit context.

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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