getPredictionTimelineStages

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

The annotations already declare readOnlyHint=true, so the lack of mutation warnings is acceptable. The description adds useful behavioral detail by listing the exact stages returned, the status vocabulary (Done/Active/Upcoming), and the chaining requirement to getPredictionGroupStageDetail. This goes beyond what the schema or annotations provide.

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 front-loaded with the action, then covers return values, usage context, a parameter hint, and a downstream follow-up. It is somewhat repetitive across 'with their current status,' 'Done/Active/Upcoming,' and the 'Agent hint' section, but the content is dense and each part adds practical value.

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?

For a single-parameter read-only tool with no output schema, the description adequately explains return categories, provides a concrete call example, and tells the agent what to do next with the result. The main gap is the incomplete semantics of eventType and the unspecified behavior when it is omitted.

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?

Schema description coverage is 0%, so the description must compensate. It does provide one concrete semantic anchor: 'FIFA 2026 (eventType=1).' But it does not explain what eventType generally represents, whether it is truly optional despite being listed as not required, or how other event types could be specified.

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 states a specific action ('Query the tournament stages timeline') and identifies the returned resource: all tournament stages with their current status. It names concrete stages and statuses, which makes the tool's purpose clear. It does not explicitly contrast with sibling prediction tools like getPredictionEventDetail or getPredictionMatchList, so it stops short of a 5.

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 gives clear usage context: 'AI agent uses this to understand the current tournament phase and navigate to the relevant stage for predictions.' It also provides a concrete hint for FIFA 2026 with eventType=1 and names the downstream tool getPredictionGroupStageDetail. However, it does not explicitly state when to avoid this tool or how it differs from nearby alternatives.

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