Update note

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

Annotations already indicate the operation is destructive and not read-only, and the description reinforces this by saying fields are 'replaced.' It adds valuable behavioral detail beyond the annotations: omitted fields are left untouched and the slug never changes, which clarifies partial-update semantics and identity stability.

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 short sentences, no filler. The first sentence states the operation and scope, the second clarifies the partial-update behavior, and the third removes a common concern about identifier changes. Every sentence earns its place.

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 simple 4-parameter mutation tool with full schema coverage and no output schema, the description covers the essential behavioral contract: what can be changed, what is preserved, and what remains stable. Nothing critical is missing for an agent to invoke the tool correctly.

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 100%, so the baseline is 3, but the description adds meaning by grouping 'title, body, and/or tags' as optional replacement fields and specifying that the slug is immutable. This helps an agent understand that omitting a field means preserving its current value, which the schema alone does not convey.

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?

The description uses a specific verb ('Replace') with a clear resource ('an existing note') and names the exact fields that change: title, body, and/or tags. It is instantly distinguishable from the sibling tools create_note, read_note, list_notes, search_notes, and delete_note.

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 description clearly situates the tool as a mutation of an existing note, which implicitly excludes creation, reading, listing, searching, and deletion. It does not explicitly name alternatives or state when not to use it, but the context is clear enough for agent selection.

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