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 agent knows it's a safe read operation. The description adds context that it is hosted by the platform, requires prepaid credits per consultation, and that the client is the data controller under LGPD. This is useful but does not contradict annotations, and it covers the lack of auth details implicitly. Score 3 is appropriate as it enriches but doesn't fully describe all behaviors.

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 paragraph, concise, and front-loaded with the purpose. It includes extra legal/payment context that are relevant to usage. It is not overly verbose, but could be structured better with sections for clarity.

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?

Given there is no output schema, the description should explain what the tool returns, but it does not. However, the complexity is moderate with 3 params, but no parameter details. Annotations cover safety. The description covers the source and legal context but lacks return format and parameter specifics, making it incomplete.

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. However, it provides no details on the parameters (cnpj, periodo, data_pagamento). The description only mentions the resource, not the inputs. For a tool with 3 params, this is a significant gap, so score 2.

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 specifies the verb 'consultar' and the resource 'Simples (Emissão de DAS de MEI)' and adds the context of 'fonte oficial' and 'consulta em fonte oficial'. It distinguishes from siblings by being the only tool that queries Brazilian official sources for Simples/DAS data, though it does not explicitly compare to siblings.

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 does not state when to use this tool versus alternatives, nor does it mention any exclusions or prerequisites beyond the general mention of official sources. It implies usage for consulting MEI DAS information but lacks explicit guidance on when not to use it or alternatives.

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