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

With no annotations, the description must carry the behavioral burden. It mentions properties like 'append-only' and 'non-substitutable', which hint at data semantics, but it does not clarify whether the tool reads or writes, what it returns, or what side effects occur. The mention of canonical resolution and a 'gen-2 door' is cryptic and fails to describe observable behavior of the tool call itself.

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 short, but it is not front-loaded with the most critical information—what the tool does. Instead it leads with an abstract characterization of a protocol. The prose is efficient but obscure, making it less usable than a concise action-oriented statement. No redundancy, but poor prioritization.

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-parameter get tool with no annotations and no output schema, the description leaves out fundamental details: what the tool returns (presumably the seven signals, but not stated), any prerequisites, or what 'canon resolves' means practically. An agent cannot tell what result to expect or how to interpret the response, making the definition incomplete for reliable use.

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 has zero parameters, so the baseline per the guidelines is 4. The description adds nothing about parameters because none exist; there is nothing to explain beyond the empty schema, which is already fully described at 100% coverage.

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 describes 'the deterministic signal protocol every GSC surface speaks' but never states what the tool does when invoked. There is no explicit verb like 'retrieve', 'query', or 'return'. It reads as a definition of the ACM-68000 standard rather than a tool action, leaving the agent without a clear idea of the operation it would perform.

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?

There is no guidance on when to use this tool versus any of the siblings. The list of sibling tools includes get_brand, search_brands, and others, but the description gives no hint about which scenario would call for get_acm_68000. No exclusions, no context, no alternatives are mentioned.

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