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

Annotations already establish readOnlyHint=true and destructiveHint=false, so the safety profile is covered. The description adds genuinely useful context beyond that: no authentication is required, no publication side effect occurs, and on failure the previous checkpoint should be retained, plus a 60-second wait directive. These are non-obvious operational traits an agent would otherwise have to discover by trial.

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 the core action and followed by operational constraints; nothing is padded. It is slightly over-compressed in places ("wait 60 seconds" lacks an explicit trigger, though failure context is implied).

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?

An output schema exists, so return values need not be explained, and the failure/retry behavior is covered. However, with four undocumented parameters and no routing guidance relative to the many sibling task tools, the definition is only minimally sufficient for correct invocation.

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?

All four parameters (since, skill, state, max_effort_minutes) have 0% schema description coverage, and the description explains none of them. The phrase "query-bound checkpoint" hints that `since` carries a cursor/checkpoint value, but the format, the meaning of max_effort_minutes, and the filtering combinations are left entirely to inference.

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 has a verb ("Read") and a resource ("task differences"), but "bounded current task differences from a query-bound checkpoint" is jargon that leaves the actual output shape uncertain. It never mentions how it relates to siblings like commons_tasks or commons_task, so an agent cannot easily place it in the family.

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?

There is no statement of when to choose this tool over commons_tasks, commons_task, or commons_contributions. The only operational guidance (keep the old checkpoint on failure, wait 60 seconds) concerns retry behavior, not tool selection.

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