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

Annotations already cover read-only/idempotent/non-destructive, yet the description still adds substantial context: metered as one execution, sessionId provenance, the ~2 second inline threshold, and an explicit 'do not resend the call' instruction. That is exactly the beyond-annotation disclosure the bar asks for.

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?

The triggering condition is front-loaded and every sentence carries information (usage, safety, required inputs, async behavior). It is slightly dense and mixes purpose, params, and lifecycle in one block, but nothing is padding.

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 metered session-scoped tool with no output schema, the description covers the full lifecycle: how to get the session, the per-call billing, the fast-path return, and the async fallback to operation_status/operation_output. An agent has everything needed 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% and each field (path, limit, sessionId, operationId, deadlineAt, idempotencyKey) is documented in the schema itself. The description's mention of sessionId and a 'new operationId' restates schema content rather than adding syntax or edge-case meaning, 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 and resource ('recent commit history of an approved project') and opens with the exact trigger phrasing 'Use this when the user wants...'. An agent can distinguish it from git_diff and git_status without opening any schema.

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 a clear when-to-use trigger and names the follow-up tools (operation_status, operation_output) for the async case. It never explicitly excludes git_diff/git_status-style scenarios, so the sibling routing is implied rather than stated.

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