Serena MCP Server

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

No annotations are provided, so the description carries full burden. It discloses key behavioral traits: it analyzes files, lists top-level symbols with name_path and kind, and returns a JSON object mapping relative paths to symbol info. However, it doesn't mention potential limitations like performance impact, file size constraints, or error conditions. The description adds useful context but lacks comprehensive behavioral disclosure.

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 appropriately sized with four sentences that each serve distinct purposes: stating the tool's function, explaining what it lists, providing usage guidance, and describing the return format. It's front-loaded with the core purpose. While efficient, the final sentence could be slightly more concise by integrating return format details earlier.

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 the tool's moderate complexity (symbol analysis), no annotations, and no output schema, the description does a good job covering the essentials: purpose, usage context, and return format. However, it could better address behavioral aspects like what happens with invalid paths or large directories. For a read-only analysis tool, it's mostly complete but has minor gaps.

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 100%, so the schema already fully documents both parameters. The description doesn't add any parameter-specific information beyond what's in the schema (e.g., it doesn't explain relative_path conventions or max_answer_chars implications). With high schema coverage, the baseline is 3 even without param details in the description.

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 clearly states the tool's purpose with specific verbs ('gets an overview', 'list the top-level symbols') and resources ('file or directory', 'code symbols'). It distinguishes itself from siblings like 'read_file', 'find_symbol', and 'list_dir' by focusing specifically on symbol extraction rather than file content, symbol location, or directory listing.

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 explicit guidance on when to use this tool: 'Calling this is often a good idea before more targeted reading, searching or editing operations on the code symbols.' This gives clear context for its role as a preparatory step for other operations, distinguishing it from direct manipulation or search tools.

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