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

With no annotations, the description carries the full behavioral burden. It discloses the auth requirement and required id, which is useful, but says nothing about the critical update semantics: whether unspecified fields are preserved or cleared, whether the operation is idempotent, or what happens if the id doesn't exist.

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 compact clauses with zero filler, and the core action is front-loaded. It is arguably too terse for a five-parameter mutation tool, but nothing is wasted or padded.

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 mutation tool with no annotations, no output schema, and zero schema description coverage, the description is thin. Partial-update behavior, error conditions, and the meaning of the collection field are all left for the agent to guess.

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%, so the description must compensate. It names the three optional fields and identifies the two required ones as prerequisites, covering all five parameters at a shallow level, but it adds no format, constraint, or interaction detail beyond the bare field names.

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 and resource ('Update one of your memories') and enumerates the mutable fields (content, tags, collection). It doesn't explicitly differentiate itself from siblings like memory_remember or memory_forget, but the name plus field list leaves little ambiguity about what it does.

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?

The only guidance is a prerequisite note ('Needs your api_key and the memory id'). There is no statement of when to reach for this tool over memory_remember, memory_forget, or memory_recall, and no exclusions or conditions.

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