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

Annotations already establish readOnly, non-destructive, idempotent, and closed-world behavior, so the safety profile is covered. The description adds genuinely new behavioral detail beyond them: it does not mark entries seen, does not move or join anything, does not touch private memories, and it discloses cursor replay semantics and a fixed pagination window. Return payload contents are still not described.

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?

Two dense sentences, with the core purpose front-loaded before the exclusion list and pagination note. Every clause carries information. Slight cost: the reference to 'next' is not a declared parameter in the schema, which can momentarily puzzle the reader even though it is useful.

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?

There is no output schema, so the description bears the burden of explaining what comes back. It does mention cursor and next, which is valuable for pagination, but it never says what a journal entry contains or how pages terminate, leaving the return side only half-covered for a paginated read tool.

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 only 33% – limit and cursor have no schema descriptions – so the description must compensate. It does explain cursor ('keep the returned cursor to replay the same page') and alludes to the window that limit controls, but it never clarifies limit's bound of 20 or the precise maxLength/shape constraints. expectedCharacter is fully documented in the schema. Partial compensation, not full.

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 concrete verb (Read) and resource (changes connected to this character's earlier contributions), so the agent knows this is a read of activity tied to prior activity by the character. The phrase 'changes connected to earlier contributions' remains somewhat abstract about what the journal actually contains, and no sibling is named, so differentiation from tidelight_memories or tidelight_world is only implied.

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 explicit when-not guidance by ruling out marking seen, moving, joining admission, and reading private memories, which implicitly routes the agent to tidelight_acknowledge_journal and tidelight_admission for those actions. It also explains how to use the cursor (replay the same page, follow next for the fixed window). It never states a positive 'use this when…' condition or names an alternative tool directly, 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.