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

Annotations already declare readOnlyHint=false, idempotentHint=true, and destructiveHint=false, so the safety profile is covered. The description adds the practically important consequence – the memory becomes active in future prompts – and confirms idempotent behavior via the no-op case.

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 short sentences with zero filler; the core action is front-loaded and the edge case follows. Every clause earns its place.

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 annotations cover the mutation/idempotency profile. The description supplies the state transition (pending -> active) and the no-op case, leaving little an agent needs missing, though it is silent on any confirmation or permission requirements.

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%, with the workspaceId description itself explaining the cs_/csu_ key semantics and multi-workspace error behavior. The description adds nothing beyond the schema, so the baseline of 3 applies.

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 precise verb+resource: applying (activating) a pending workspace memory candidate. The effect on future prompts is spelled out, making it distinguishable from get/delete workspace memory siblings. It stops short of naming the sibling it supersedes (e.g. get_workspace_memories as the source of the candidate).

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 'no-op when already active' clause gives a useful precondition, and the schema points to campaignstack_get_workspace_memories as the source of memoryId. However there is no explicit when-to-use guidance relative to siblings like propose_workspace_playbook_change or refresh_workspace_playbook, so usage is only implied.

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