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

Beyond the annotations (which already state readOnly=false, idempotent=true, destructive=false), the description adds two real behavioral facts: duplicates are harmless and no message is sent. That extra context matters for a write tool, though nothing is said about permissions or what happens if a candidate id is invalid.

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, front-loaded sentences: an operation marker, two behavioral notes, and the endpoint. Every clause adds information and nothing is repeated from the name or annotations.

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?

For a two-parameter write tool with no output schema, the description covers the operation, duplicate semantics, notification behavior, and endpoint. It doesn't address error conditions or partial failures when a subset of candidate_ids is invalid, which keeps it short of complete.

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%, so the baseline is 3, but the description earns a bit more by telling the agent where pool_id comes from (taleez_list_pools) and constraining candidates to "existing" records. It still doesn't say how candidate_ids should be sourced or what the 100-item cap behavior is, so it isn't a full 5.

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 opens with a specific verb and resource ("add existing candidates to a talent pool") and the word "existing" plus "pool" cleanly separates it from taleez_create_candidate and taleez_add_candidates_to_job. An agent can identify the operation without consulting any schema.

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?

It explicitly names taleez_list_pools as the way to obtain the pool id, giving the agent a concrete prerequisite path. It lacks an explicit when-not or a direct contrast with taleez_add_candidates_to_job, but the pool-vs-job distinction is implied by the resource wording.

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