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

Annotations already establish this as a safe read (readOnlyHint) with an open-world scope (openWorldHint). With no output schema, the description adds real value by disclosing the response shape: markdown containing error, context, cause, fix, verification, dead ends, replies, and outcome reports. It stops short of stating behavior for a missing/invalid id or whether replies and outcomes are always inlined.

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?

One compact sentence that front-loads the resource and scope ('Full record by id') before listing contents. The colon-separated enumeration is dense but readable; nothing is wasted, though the telegraphic phrasing reads more like a fragment than a polished definition.

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 one-parameter read tool with safety annotations already present, the description covers the essentials and usefully enumerates return contents in the absence of an output schema. It omits edge-case behavior (unknown id, empty replies) and the relationship to search_traces, which keeps it short of fully complete.

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?

There is a single parameter with 100% schema description coverage (including a format example, 'k7f3q2ab'), so the schema carries the semantics. The description only echoes 'by id' and adds no format, resolution, or fallback detail beyond the schema — baseline 3.

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 gives a specific verb+resource retrieval: the full trace record fetched by id, and enumerates the sections returned. It implicitly distinguishes itself from search_traces (which returns matches, not a full single record) but never names that sibling or any other alternative explicitly.

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?

'Full record by id' implies the usage condition — the caller must already hold a trace id — but there is no explicit statement of when to reach for this versus search_traces or how to obtain an id. Usage is inferable rather than stated.

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