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/non-destructive profile is covered. The description adds one genuinely useful behavioral fact beyond the schema — 'Free to use — no credits consumed' — but says nothing about name uniqueness, persistence, or what happens on failure.

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 front-loaded sentence that defines the resource before listing its parts, with zero filler. It is dense — three parameter mentions packed into one em-dash clause — but nothing is wasted.

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?

Return values need not be explained since an output schema exists, and annotations cover safety. For a create tool with required nested scope and a null-able situation, however, the description omits lifecycle context (uniqueness, persistence, post-creation behavior) that an agent would need to call it confidently.

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% with fully documented nested scope/accounts/dateRange, so the schema carries the semantic load. The description restates the parameters (name, situation, scope) and adds a framing ('scoped lens') but no format or constraint detail beyond the schema.

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+resource ('Create a named memory') followed by a concise conceptual definition of what a memory is ('a scoped lens over your accounts and dates'). An agent instantly knows this is a creation tool for a scoping construct, though it never names siblings like list_memories or update_memory to sharpen differentiation.

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?

No when-to-use guidance is provided: nothing says when to create a memory versus using inline scope/date filters, how it interacts with update_memory, or whether memories persist across sessions. Only an implied usage context from the resource definition.

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