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

readOnlyHint=true already tells the agent this is a safe read, so the description's added value is the no-session_id default, which is genuine behavioral context. It does not say how many 'latest messages' are returned or whether the result is truncated relative to the full dialog, which is the key behavioral trait for this tool.

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?

Three short sentences, front-loaded with what the tool returns, followed by usage and parameter default. The phrasing is slightly colloquial ('забери целиком, а не пересказ') but each sentence carries information.

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?

Return values need not be described since an output schema exists, and the description covers the one non-obvious parameter default plus the id-discovery route. Only the extent of truncation in 'latest messages' is left for the agent to discover.

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 the description must carry the load, and it does explain session_id's fallback semantics ('most recent' when absent) and where to obtain valid ids. project_id is left unstated, but its meaning is self-evident from the tool name.

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?

Names a specific resource (the user's dialog with Chip inside a project) and states what it returns: a summary plus the latest messages. It is distinguishable from siblings because it points to get_project_context for dialog ids and does not overlap with read_journal or read_project_file.

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?

Gives a concrete scenario (a plan dictated from a phone, retrieve it whole rather than a retelling) and states the default when session_id is omitted (the most recent dialog). No explicit 'when not to use' is given, but the pointer to get_project_context for dialog ids effectively routes the agent.

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