get_player_state

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

With no annotations, the description must fully disclose behavioral traits. It does list the return contents (position, duration, state, buffering info), which provides some transparency. However, it does not mention side effects (or lack thereof), assumptions about a running media player, potential errors, or output format, leaving the agent with only partial insight.

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 a single, front-loaded sentence: 'Get current media player state (position, duration, state, buffering info).' It includes the verb, resource, and key data points with no redundancy or unnecessary words.

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?

The description covers the core function and return fields, but it does not provide context about the required environment (e.g., media player must be running), return value types or units, or when this tool is applicable relative to the UI automation workflow. Given no annotations and no output schema, more context would improve completeness, but the basic getter function is adequately described.

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 tool has 0 parameters, so there are no parameter semantics to clarify. Per the rubric, a 0-parameter tool receives a baseline of 4. The description appropriately omits parameter information since none exist.

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 function: 'Get current media player state' and specifies the exact data returned (position, duration, state, buffering info). This is a specific verb+resource and is distinct from all sibling tools, which focus on UI automation elements like webdriver sessions and element finding.

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 provides no guidance on when to use this tool versus any alternative. It simply states what it does, with no mention of context, prerequisites, or exclusions. No sibling tool is referenced, so the agent is left without explicit usage direction.

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