read_file

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

Annotations already provide readOnlyHint=true, indicating non-destructive behavior. The description adds the line-range slicing behavior, which is not covered by annotations. However, it does not disclose other behavioral traits like encoding assumptions, file existence errors, or output format. With annotations covering safety, this is adequate but not thorough.

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 of 8 words, with no unnecessary verbiage. It is front-loaded with the core action and concisely adds scope. Every word earns its place.

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?

Given no output schema and the tool's simplicity, the description covers the input and basic behavior. However, it omits details like return format (list of strings?), error handling (e.g., file not found), or constraints (e.g., file must be UTF-8). It is minimally adequate but could be more 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?

Schema description coverage is 67% (offset and limit have descriptions, path does not). The description mentions 'line-range slicing', which reinforces offset and limit, but does not explicitly describe the path parameter beyond implying it refers to a text file. It adds some context but does not fully compensate for the missing schema description on path.

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 'Read a text file with optional line-range slicing' uses a specific verb (Read) and resource (text file), and adds the line-range slicing detail that distinguishes it from sibling tools like write_file or list_directory. It clearly communicates the tool's primary function.

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 implies usage for reading text files, optionally with line-range slicing. However, it does not explicitly state when not to use this tool or mention alternatives (e.g., using run_command with cat). The context is clear but lacks exclusion guidance, so a 4 is appropriate.

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