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

Annotations already declare readOnlyHint=true and destructiveHint=false, so the safety profile is covered; the description reinforces this with "opens nothing by itself," which resolves the tension created by the "log" in the name. It adds genuine context beyond the annotations: the return content (screens, buttons, fields), the required follow-up browser tools, and the fact that Fitatu exposes no public API or MCP server, which explains why browser automation is the path. It stops short of describing the output format or how large the step-by-step answer is.

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 core instruction is reasonably front-loaded, but the leading clause is wasted on a misleading restatement of the title, and the final sentence is bloated and repetitious ("Fitatu's official API: Fitatu has no public API: its site and help center list no developer docs...") including a dated verification stamp that adds little for an agent. Trimming those two elements would leave a tighter, clearer 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 zero-parameter, no-output-schema guidance tool, the description covers what it returns, that it performs no action, and which tools to use next, which is close to sufficient. What is missing is how this fits against the other fitatu_log_* siblings and whether those are also guidance-only or actually execute, leaving the agent to guess which logging entry point to pick.

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?

The tool takes zero parameters, so the schema has nothing to document and there is no semantic gap for the description to fill. Baseline 4 applies; no parameter claims are made or needed.

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 opening sentence "Log quick entry in the user's own Fitatu account" merely restates the title and implies the tool performs the logging, which is misleading. The second sentence corrects this by stating it "Returns how to do it in Fitatu step by step (screens, buttons, fields) and opens nothing by itself," so the real purpose (an instructional/guidance tool) does emerge, but only after the reader works past the contradiction. It also never distinguishes itself from siblings like fitatu_log_food or fitatu_log_measurement.

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?

It does prescribe a workflow: call this to get step-by-step guidance, "then do it with the cotlet_browser_* tools in the user's Fitatu Cloud Browser." That is useful sequencing guidance. However, it gives no condition for choosing this over the sibling fitatu_log_food / fitatu_log_measurement tools, nor any prerequisites or exclusions.

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