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

With no annotations, the description carries the full burden and does so well: it discloses the 404 when the memory is not yours, the 200-item cap with a signal that more remain, the destructive/auth requirement (secret memory_key generated by the caller), and cost/rate limits ($0.002 per call, 3 free calls a day). This is exactly the behavioral context an agent needs before a destructive operation.

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?

One dense but front-loaded block: the core purpose leads, then the two modes, then auth and pricing. Nearly every clause earns its place, though the trailing pricing sentence is secondary detail that could be moved or trimmed.

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?

No output schema exists, and the description compensates by telling the agent the tool reports whether more memories remain. Combined with mode semantics, auth requirements, caps, and cost, nothing needed to invoke this correctly is missing.

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 coverage is already 100%, so the baseline is 3. The description still adds meaning beyond the schema: it explains that memory_id is the single-target path, that the entity params form an at-least-one group for bulk mode, and that memory_key is caller-generated and unrecoverable. That exceeds the structured field text.

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?

States a specific verb (delete) and resource (stored memories), then splits the behavior into two clearly distinguished modes: single-memory deletion by memory_id versus bulk deletion by entity. An agent can tell exactly what this does 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?

Gives explicit when-to-use branching: pass memory_id for one memory, omit it and supply at least one of user_id/agent_id/app_id/run_id for bulk. It also states the memory_key prerequisite and that other keys cannot delete. It stops short of naming the sibling tools (get_memories/search_memories) as alternatives, so it is clear context without full routing.

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