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u21h2

BinDiff MCP Tool

by u21h2

bindiff_compare

Compare two binary files to identify identical, changed, and unmatched functions using IDA Pro and BinDiff analysis.

Instructions

Compares two binary files using IDA Pro and BinDiff.
Resulting detailed difference lists are saved to the specified directory (default: current directory).
Generated files:
1. matched_similar.json (Identical functions)
2. matched_different.json (Matched but Changed functions)
3. primary_only.json (Unmatched in Primary)
4. secondary_only.json (Unmatched in Secondary)

Args:
    primary_binary: Path to the first binary (e.g. original)
    secondary_binary: Path to the second binary (e.g. patched)
    output_results_dir: Directory to save the result files (default: current dir)

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
primary_binaryYes
secondary_binaryYes
output_results_dirNo.

Output Schema

TableJSON Schema
NameRequiredDescriptionDefault
resultYes
Behavior4/5

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

With no annotations provided, the description carries the full burden of behavioral disclosure. It effectively describes key behaviors: it performs a comparison (implying read-only analysis), saves results to files, lists the specific output files generated, and specifies a default directory. This covers essential operational traits without contradictions.

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?

The description is appropriately sized and front-loaded, starting with the core purpose, followed by output details and parameter explanations. Each sentence adds value without redundancy, making it efficient and well-structured for quick understanding.

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 the tool's complexity (binary comparison with file generation), no annotations, and an output schema present, the description is largely complete. It explains the purpose, behavior, and parameters thoroughly. However, it could slightly enhance completeness by mentioning potential prerequisites (e.g., IDA Pro/BinDiff installation) or error handling, though the output schema may cover return values.

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

Parameters5/5

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

The schema description coverage is 0%, so the description must compensate. It adds significant meaning beyond the schema by explaining each parameter's purpose (e.g., 'Path to the first binary (e.g. original)'), providing examples, and clarifying the default behavior for the output directory. This fully documents all three parameters.

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 tool's purpose with specific verbs ('compares two binary files') and resources ('using IDA Pro and BinDiff'), and distinguishes its function by detailing the output files generated. It goes beyond a simple restatement of the name to explain what the comparison 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 implies usage context by specifying the types of binaries (e.g., 'original' vs. 'patched') and the default output directory, but it does not explicitly state when to use this tool versus alternatives or provide any exclusions. With no sibling tools, this is adequate but lacks explicit guidance.

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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