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

With no annotations, the description carries the full burden; it does convey the read-only nature implicitly ("View", "see", "Shows") and discloses the categories of data exposed. It stops there, saying nothing about permissions/auth requirements, per-call cost, or whether the profile is scoped to the calling agent versus a shared vault.

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?

Two short sentences, front-loaded with the tool's context. There is mild redundancy: the trailing "Shows what data you have stored in our vault" restates "total stored data items" from the prior sentence, so it is efficient but not waste-free.

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 zero-required-parameter, single-enum read tool with no output schema, the description covers purpose and exposed fields sufficiently. The one gap is that the 'detail' mode is never explained, leaving the agent to infer what 'all_keys' widens the response to.

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% for the single 'detail' enum, so the baseline is 3. The description adds nothing about what 'summary' vs 'all_keys' actually returns, so it neither compensates nor detracts; the schema does all the work.

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 ("View your agent profile") with an enumeration of exactly what is returned: agent ID, stored data item count, usage stats, and subscription status. That is clear and self-contained, but it never positions itself against the closely related siblings agent_memory, memory_list, and memory_search, so an agent cannot rule them out from the text alone.

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 and no exclusions. The description never explains when an agent should call agent_profile rather than agent_memory, memory_list, or memory_search, despite those siblings clearly overlapping in the 'stored data' space.

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