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

With no annotations, the description carries the full burden. It usefully discloses the 'PRO' paid-tier gating and clarifies that 'removed' means possible revocation or surrender, which is real semantic value. However it says nothing about return format, pagination, or what happens with an absent access_token.

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?

Two compact sentences, front-loaded with the tier marker and the core delta definition. The parenthetical clarification earns its place; nothing is padded.

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 simple one-parameter read tool with no output schema and no annotations, the description covers what the tool is and the tier requirement. Gaps remain around result shape, ordering, and volume, which an agent would want given there is no output schema to fall back on.

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?

Single parameter with 100% schema description coverage, so the schema already explains access_token sourcing. The description adds nothing about the token, but it also doesn't need to — baseline 3 applies when the schema does the work.

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?

Names a specific resource (sponsor register) and a specific delta scope (organisations added or removed since the previous daily update), plus a useful gloss on 'removed'. It does not differentiate itself from siblings like sponsor_search or register_stats, and the name alone would be ambiguous without the description.

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 phrase 'since the previous daily update' implies a monitoring/change-tracking use case, but there is no explicit when-to-use, no when-not-to-use, and no pointer to sponsor_search or register_stats for other needs. The agent must infer the routing decision entirely.

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