tab_complete

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 what the tool does (provides autocomplete suggestions), the context (like pressing Tab in Minecraft), and the return behavior (formatted list or message if none available). It doesn't mention rate limits or error handling, but covers the core behavior well.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is well-structured and appropriately sized. It starts with a clear purpose statement, follows with usage guidelines, then provides parameter details, return information, and concrete examples. Every sentence adds value with zero wasted content.

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

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

Given the tool's moderate complexity (single parameter, no annotations, but with output schema), the description is complete. It explains the purpose, usage, parameter with examples, and return behavior. The existence of an output schema means the description doesn't need to detail return values, and it adequately covers what's needed for this autocompletion tool.

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

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 provides a clear parameter description: 'command_line: The partial command line to complete' with three concrete examples that illustrate valid inputs. This adds significant meaning beyond the bare schema, though it doesn't detail all possible command formats.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the tool's purpose: 'Get tab completion suggestions for a partial Minecraft command.' It specifies the exact action (get suggestions) and resource (Minecraft commands), and distinguishes it from the sibling tool 'execute_command' by focusing on autocompletion rather than command execution.

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

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

The description explicitly states when to use this tool: 'Useful for discovering available commands, subcommands, and valid arguments.' It provides clear context for its purpose (autocompletion like pressing Tab) and distinguishes it from the alternative 'execute_command' by not overlapping in functionality.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.