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analyze_position

Analyze any chess position from a FEN string to get engine evaluation, top move lines, material balance, and tactical flags like forks and pins, explaining why a move is best.

Instructions

Evaluate a single position (FEN) and return the top engine lines.

Returns evaluation in centipawns and win%, the best lines in SAN, material
balance, and simple tactical flags (fork threats, pins). Use this to explain
*why* a move is best in a specific position.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
fenYes
depthNo
multipvNo
Behavior4/5

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

No annotations provided, so the description carries the full burden. It discloses expected outputs: centipawns, win%, SAN lines, material, tactical flags. It does not mention side effects or constraints, but the description is transparent about what the tool does and returns.

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 three sentences, front-loaded with action and returns, with no wasted words. It is efficiently structured and easy to scan.

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 no output schema and no annotations, the description covers the main outputs and use case. It lacks some details like limits or prerequisites, but is fairly complete for a straightforward analysis tool.

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

Parameters2/5

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

Schema description coverage is 0%, and the description does not explain individual parameters like depth or multipv. It mentions 'FEN' implicitly but lacks details on parameter meaning or defaults.

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 evaluates a single position (FEN) and returns engine lines, evaluation, material balance, and tactical flags, distinguishing it from sister tools like analyze_game which likely analyzes entire games.

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 explicitly says 'Use this to explain *why* a move is best in a specific position,' providing clear context for when to use. It does not contrast with siblings, but the guidance is sufficient.

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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