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find_field_writes

Find all locations in Java source code where a field value is mutated, including assignments and increments. Useful for tracking state changes in data flow analysis.

Instructions

Find all write accesses (mutations) to a field.

USAGE: Position cursor on a field declaration or reference OUTPUT: List of locations where the field is modified

IMPORTANT: Uses ZERO-BASED coordinates.

Unlike find_references which returns all usages, this returns only locations where the field value is changed (assignments, increments, etc). Useful for data flow analysis and understanding state mutations.

Requires load_project to be called first.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
maxResultsNoMax write locations to return (default 100)
filePathYesPath to source file
columnYesZero-based column number
lineYesZero-based line number
Behavior4/5

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

No annotations present, so description carries full burden. It discloses zero-based coordinates and the requirement for load_project. However, it does not explicitly state it is a read-only operation or mention any side effects.

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?

Well-structured with distinct sections (USAGE, OUTPUT, IMPORTANT, differentiation). Each sentence adds value without redundancy.

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

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a find tool with no output schema, the description covers usage, prerequisites, coordinate system, and differentiation from siblings. No significant gaps.

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% with descriptions for all parameters. The description reinforces zero-based coordinates but does not add new semantic information beyond the schema.

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 it finds write accesses to a field, using specific verbs and resources. It distinguishes from sibling find_references, which returns all usages.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Provides explicit usage instructions: position cursor on field declaration/reference, and prerequisite to call load_project first. Also contrasts with find_references.

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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