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

With no annotations, the description carries the full burden and does so well: it discloses that the output is executable commands, that only differing files are replaced, and that existing files are backed up as .bak. It omits permission/auth requirements and any no-op/error behavior, but the mutation semantics are unusually well surfaced for a description-only tool.

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 purpose, then use-cases, then effect of execution. Sentences each carry distinct information, though the enumeration and repeated trigger phrasing make it slightly longer than strictly needed.

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?

No output schema and no annotations, so the description must explain the return value and side effects — which it does (returns commands; executing them swaps only differing files with .bak backups). What remains unstated, such as behavior when nothing needs updating, is minor for a 1-param procedural tool.

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 sole parameter (base_url) is optional and already documented ('接続先（通常は指定不要）'). The description adds no parameter-level detail, so the baseline 3 applies.

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+resource (b612 のアップデート) and enumerates the asset classes touched (エージェント・法令ファイル・業種プリセット・雛形・参照ドキュメント). Critically it clarifies the tool returns a procedure/commands rather than performing the update itself. Sibling differentiation is only implicit, but the scope is unambiguous.

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?

Provides explicit trigger phrases (「b612 をアップデートして」「b612 を最新にして」) and two concrete triggering situations (新エージェント追加時、法令改正時). It does not name a when-not condition or a routing alternative among the sibling b612_* tools, so it stops short of a 5.

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