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

Annotations already declare destructiveHint=true and non-idempotent, so the safety profile is known. The description adds genuine context beyond that: only the targeted block is removed ("Every other block stays as it is") and the action is reversible via history/undo. It does not mention whether removal frees the id or how the parent reflows, keeping it below a 5.

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 with three tight clauses and no filler; each clause carries scope, source of the id, or recoverability. The "in a column, it leaves the column" phrasing is slightly awkward but earns its place as a scope clarification.

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 destructive, non-idempotent tool with full schema coverage and no output schema, the description covers the crucial points: what is destroyed, what is preserved, and how to reverse it. Error behavior for an unknown id or cross-page id is unaddressed, so it is strong but not exhaustive.

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%, so the four parameters are already documented, and the description only echoes the id's origin from read_page. It adds no syntax, format, or default detail beyond the schema, making the baseline 3 correct.

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 ("Take one block off a page") and scopes it precisely with "in a column, it leaves the column," which separates it from column/page-level deletions and from move_block or update_block. It does not name a sibling explicitly, so it stops short of a 5.

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?

"By its id from read_page" tells the agent where the identifier comes from, and the undo/history mention points to recovery paths, so usage is clearly implied. There is no explicit when-not-to-use guidance or a named alternative such as move_block or update_block for non-removal edits.

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