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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, covering the basic safety profile. The description adds 'privacy-filtered project metadata,' which could imply that the tool filters metadata before updating, but this is ambiguous and not elaborated. No contradictions with annotations, but the added behavioral context is minimal and vague.

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 description is a single sentence, which is concise and not bloated. However, it is overly short and lacks structure – there is no breakdown of purpose, parameters, or usage. While brevity is valued, the sentence fails to provide necessary context, making it ineffective despite its efficiency.

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 7 parameters (including a nested object), no output schema, and zero schema descriptions, the description is woefully incomplete. It does not explain the sync lifecycle, the meaning of the required fields, the role of idempotency, or how this tool relates to other sync tools. An agent cannot correctly invoke this tool based on the provided description alone.

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 0%, so the description must compensate for the lack of parameter documentation. However, the description does not mention any parameter names or explain what projectId, handoffId, idempotencyKey, expectedVersion, or the nested details object represent. The phrase 'privacy-filtered project metadata' is too vague to map to any specific parameter. The agent receives no semantic help beyond the parameter names themselves.

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 verb ('Update') and a resource ('hosted relay sync completion'), but the resource is ambiguous – what exactly is 'relay sync completion'? It does not distinguish this from sibling tools like begin_project_sync, commit_project_sync, or seal_project_sync. The mention of 'privacy-filtered project metadata' hints at a distinguishing feature but remains unclear. Overall, the purpose is partially conveyed but lacks specificity.

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?

The description provides no guidance on when to use this tool versus alternatives. It does not mention the sync lifecycle, prerequisites, or conditions for calling it. Sibling tools such as begin_project_sync, commit_project_sync, and get_project_sync_status exist, but there is no indication of how this fits. The agent is left to infer the usage context, which is inadequate.

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