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

With only readOnlyHint=true in annotations, the description carries real weight and delivers: supported formats, a hard 100 KiB analysis limit, the fact that other files stay downloadable but unanalyzed, that content is untrusted data (prompt-injection warning), and that access is validated against current project membership. That is behavior an agent cannot get from the annotations or schema.

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?

Four tight sentences, front-loaded with the action, then return shape, then limits, then the safety caveat. Every sentence carries information an agent needs and none restate the tool name or the annotations.

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 exists, so the description correctly specifies the return (original metadata plus UTF-8 text). For a read-only two-parameter tool it covers format support, size ceiling, failure-to-analyze behavior, trust level, and authorization — nothing an agent needs before calling is missing.

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 both UUID parameters are documented only by name and format. The description partially compensates by explaining that access is checked against current project membership, which clarifies project_id's role as the authorization scope, but it says nothing about which file_id is acceptable or what happens on a mismatched pair.

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 (read a shared project file) and precisely defines the supported scope: txt/md/csv/tsv/json up to 100 KiB. What's missing is explicit differentiation from siblings like read_file_content or download_file_content — the agent must infer that the 'shared project' qualifier and the project_id parameter are what separate this tool.

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?

Usage is implied rather than stated: you call it to read a file that lives in a shared project. The line 'Other files remain downloadable but are explicitly not analyzed' gestures at an alternative path (download tools) without naming it, and no sibling is called out by name. An agent can infer the right context but gets no explicit when-not guidance.

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