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

Annotations already declare destructiveHint=true, idempotentHint=true, and readOnlyHint=false, so the safety profile is largely carried by structured data. The description adds real value by clarifying that archiving retires a series yet "nothing is deleted," which softens the destructive hint into a semantic consequence rather than data loss. It does not say whether omitted fields are preserved or cleared, which matters for a partial-update mutation.

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 tight sentences: the mutable field set comes first, followed by the status semantics that carry the most decision weight. No filler, no restatement of the title, and the most consequential clause ("nothing is deleted") lands at the end for emphasis.

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?

An output schema exists, so return values need not be described, and with one required key plus optional fields the shape is simple. The description covers the field set and the risky status transition. The remaining gap is update semantics: whether omitted optional fields are left untouched or reset, which an agent may need to know before calling.

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% and the schema already explains every parameter, including the empty-string removal convention for template and cadence_hint, so the baseline is 3. The description mildly reinforces field meaning ("when it usually goes out" for cadence_hint, "its template" for template) but adds no syntax or format detail beyond the schema; the slight lift comes from pairing the fields with the status semantics in one coherent statement.

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 plus resource ("Change a series") and enumerates exactly which attributes are mutable: label, template, cadence, status. It also implicitly separates itself from create_series and list_series, and covers the absence of a delete sibling by declaring that archiving is how a series ends.

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?

Gives clear guidance on choosing between the two meaningful status values (paused = temporary stop, archived = retire), which is the key decision an agent faces here. It stops short of naming sibling tools explicitly (e.g., use list_series to find the key, or that no delete tool exists), so it is clear context rather than full alternative routing.

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