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

No annotations are provided, so the description carries the full burden of behavioral disclosure. The verb 'Retrieve' implies a read-only operation, but there is no explicit statement about side effects, required permissions, or pagination behavior. The mention of 'cursor positions' hints at pagination but is not explained.

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 one concise, front-loaded sentence that communicates the action, target, and included fields without redundancy. Every word contributes to the meaning.

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 retrieval tool with an output schema, the description is adequate but has clear gaps. It does not explain how session_id is used, what 'cursor positions' mean, or how this tool relates to similar sibling tools. The output schema likely covers return structure, but the description could still provide more context for proper selection and 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 input schema has no description for session_id (0% coverage), and the tool description does not mention session_id at all. It fails to explain what session_id refers to (e.g., the agent session identifier) or any format requirements beyond the schema's type and minLength. The parameter name is self-explanatory to some extent, but no additional meaning is added.

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 clearly states a specific action ('Retrieve') and a specific resource ('agent session decisions from the CoreCrux Decision Plane'), and it lists included elements (decision IDs, outcomes, cursor positions). This distinguishes it from sibling tools like get_decisions_on_stale_context or get_checkpoints by focusing on session decisions and cursor positions.

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 provides no guidance on when to use this tool versus alternatives. There is no mention of prerequisites, typical scenarios, or references to sibling tools such as record_decision_context or get_decisions_on_stale_context.

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