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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the crucial non-schema fact that this endpoint is deprecated and yields no commission, which is exactly the behavioral context an agent needs. It does not describe the response shape, a minor remaining gap.

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?

Three short sentences, front-loaded with the deprecation status, then the constraint, then the redirect. Every sentence earns its place with no filler.

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 no-argument, read-only legacy tool with no output schema, the definition gives an agent everything needed to decide correctly: it is dead, call it only for compatibility, and go elsewhere for real work. Only the exact return behavior of a compatibility call is left unstated.

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 takes zero parameters, so there is nothing for the description to disambiguate. Baseline 4 applies, and the prose correctly avoids inventing any parameter behavior.

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 status: this reward program has ended, the tool is kept callable only for compatibility, and no new commission is offered. That clearly distinguishes it from active siblings and prevents an agent from treating it as a live earning path. It stops short of saying what a call actually returns, which keeps it from 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?

It explicitly tells the agent not to expect rewards here and routes it to speedbot_earning_opportunities for current work and reward availability. When-to-use, when-not-to-use, and the alternative are all named.

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