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bfernandesbfs

ios-instruments-mcp

analyze_allocations

Profile iOS app memory allocations: record a trace, detect peak memory usage, identify top allocation types, and get fix suggestions.

Instructions

Record an Allocations trace and report peak memory, top allocation types, 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).
Behavior2/5

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

No annotations provided. Description briefly mentions 'record' and 'report' but lacks details on side effects, permissions, trace lifecycle, or whether data is persisted. Insufficient for a tool that likely writes state.

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?

Single sentence conveying action and outputs with no unnecessary words. Could be slightly more structured but efficient.

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?

No output schema, but description hints at report contents. Missing details on return format, whether results are returned directly, and the role of time_limit_seconds parameter. Adequate but not comprehensive.

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 covers all parameters with full descriptions. Description adds no extra parameter-specific context, so baseline 3 applies.

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?

Description clearly states action (record) and resource (Allocations trace) and outputs (peak memory, top allocation types, fix suggestions). Distinguishes from siblings which focus on different analysis types.

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 on when to use this tool vs alternatives (e.g., analyze_allocations_trace). Does not mention prerequisites or 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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