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

Annotations already declare destructiveHint=true and readOnlyHint=false, and the description adds substantial value beyond them: the old version stays in history (recoverability), a hard 10 MB limit, the file/content_base64 selection rule, and the fact that the call returns validation checks (broken note refs, compile/render/test results).

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?

Front-loaded with the core action and dense with actionable detail — no filler sentences. It runs long and crams markdown/tracker syntax into one clause, but nearly every clause carries operational information.

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?

With no output schema, the description compensates by describing the return payload (checks, compile/render/test results), the replace semantics, history retention, size limits, and the note-data format including checklists, links and tracker table syntax. An agent has enough to call it 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 real discriminator meaning: `file` (from chat) versus `content` for text versus `content_base64` with `mime_type` for binary, plus the 10 MB ceiling. The path examples are somewhat redundant with the schema description.

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 states a specific verb and resource — writes a whole note, app file, data.json or file, creating or fully replacing it. This clearly separates it from an incremental edit, but it never names the `edit` or `create` siblings explicitly, so sibling differentiation is left to inference.

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?

It gives an important precondition (an existing item must have been read in this session) and implicitly contrasts whole-replacement with partial editing. However, it never states when to prefer `create` or `edit` over `write`, so the agent must infer the routing.

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