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

Annotations already declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the write-without-destruction profile is covered. The description's contribution is the words 'fictional' and 'synthetic', which usefully signal this operates on throwaway sandbox data rather than real records; it says nothing about required permissions, idempotency, or what happens on a bad decision_id.

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?

A single short sentence with no filler, so it is certainly concise, but it is under-specified rather than well-structured. Nothing about ordering, return behavior, or prerequisites is front-loaded because nothing beyond the core action is present.

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 four-parameter mutation with no output schema and no parameter documentation, the definition leaves large gaps: no indication of what the call returns, whether the referenced decision must pre-exist, or how evidence_ref is validated. What annotations do not cover, the description does not either.

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% across four required parameters, and the description does not compensate: sandbox_key, decision_id, summary and evidence_ref are never explained, nor is the expected form of evidence_ref or whether decision_id must reference an already-recorded decision. The loose mapping of 'observed action' to summary/evidence_ref is the only hint.

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 states a verb ('Attach') and two resources ('fictional observed action', 'synthetic decision'), which puts it in the vicinity of its siblings reserve_sandbox_record_decision and reserve_sandbox_record_outcome. However, the phrasing is abstract jargon and never makes explicit that this records an action against an existing decision, so the distinction from sibling recorders is only weakly conveyed.

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 when-to-use guidance, no prerequisites, and no mention of when to prefer record_decision or record_outcome instead. The agent must infer everything about sequencing from the verb alone.

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