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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is covered. The description still adds real value beyond them: permanence including saved history, the required permission scope, and the archive-vs-delete decision. It does not, however, describe failure behavior or what happens to dependent references.

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?

Three sentences, front-loaded with the destructive action. The closing sentence largely duplicates the schema's playbook_id description, which is the only bit of slack in an otherwise tight definition.

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 two-parameter destructive tool with full annotation coverage and no output schema, the description supplies what an agent needs: permanence, permission requirement, and the safer alternative. Only edge-case behavior (errors, cascading effects) is left implicit.

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 100%, so the baseline is 3. The final sentence restates playbook_id's format ('UUID or GUID'), which the schema already documents verbatim, and adds no new syntax or constraint for 'key'.

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?

Specific verb ('Permanently delete') plus resource ('a memory and its saved history'), and it explicitly distinguishes itself from the sibling archive_memories. An agent can select it without opening the schema.

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?

It names the alternative (archive_memories) and the exact condition that selects it ('To hide an entry while retaining its content'). It also states the precondition (memory:write or full permission).

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