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

The annotations already declare this a read-only, idempotent, non-destructive, closed-world call, so the safety profile is covered. The description adds value by spelling out the return contents (eligibility flag, maximums, current counts), which matters because no output schema exists; it does not cover scoping (account vs. workspace) or whether counters reset.

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?

One sentence, front-loaded with the resource and then the returned fields, with no promotional or redundant wording. Every clause maps to something the caller learns.

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 zero-param read with no output schema, the description covers what the call returns well enough to decide whether to invoke it. The remaining gap is scope: it does not state whether limits apply per account or per workspace, nor what an exhausted limit looks like in the response.

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 the description needs to disambiguate; the baseline for a no-param tool is 4. No parameter-level detail is missing.

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 uses a specific verb ('Get') plus resource ('affiliate tier limits and current usage') and enumerates the payload: program-creation eligibility, max programs/partnerships, and current counts. That clearly separates it from siblings like get_affiliate_stats and list_affiliate_programs, though it never names those siblings to draw the line explicitly.

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 'whether you can create programs' implies a pre-check before calling create_affiliate_program or join_affiliate_program, but that workflow is left to inference. There are no explicit when-not conditions or named alternatives such as get_usage or get_affiliate_stats.

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