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

Annotations already declare readOnlyHint=true, idempotentHint=true, and destructiveHint=false, covering safety. The description adds valuable context beyond annotations by specifying that the search operates across 'all saved sessions' (global scope) and that query and metadata filters can be combined or used independently. No contradictions found.

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 two sentences, front-loaded with the core action and scope. Every clause is informative, with no fluff or repetition. It efficiently communicates both the functionality and a key usage note.

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?

The tool has an output schema (so return format is covered), strong annotations, and descriptive parameters. The description fully explains the two primary usage modes (full-text search, metadata filtering, or both). It is complete for a search tool, requiring no further elaboration on behavior, prerequisites, or side effects.

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 coverage is 100% with each parameter described, so the baseline is 3. The description adds extra semantic value by explaining the relationship between 'query' and 'tags/project/status/tool_source' (can be combined) and the 'omit query for tags-only filtering' mode, which is not evident from the schema alone.

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 function: 'Search across all saved sessions.' It specifies the full-text search capability via 'query' and metadata filtering via 'tags/project/status/tool_source', distinguishing it from sibling tools like palim_search_memories (searches memories) and palim_search_by_date_range (searches by date). The scope 'all saved sessions' is explicit.

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 clear usage context: it explains that both full-text and metadata filtering can be used, and gives specific guidance with 'Omit query for tags-only filtering.' However, it does not explicitly mention when NOT to use this tool or point to alternative tools, so it stops short of a 5.

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