Bulk-import up to 5,000 contacts in one call. Existing addresses are updated rather than duplicated. Returns per-row results so you can see which rows were rejected and why.
| Name | Required | Description | Default |
|---|---|---|---|
| contacts | Yes | Contacts to import (max 5000) | |
| update_existing | No | Update contacts that already exist (default true) |
Changes observed during successful MCP inspections.
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
Annotations indicate readOnly=false and destructive=false, but the description adds context: it states that existing addresses are updated rather than duplicated and that per-row results are returned, revealing behavior beyond the annotations. This is valuable but does not cover all aspects (e.g., rate limits, transactionality).
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?
The description is two sentences, directly states the key points (bulk limit, update semantics, per-row results) with no filler or redundancy. It is front-loaded and efficient.
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?
Given no output schema, the description adds essential context about return format (per-row results, rejection reasons). It does not mention prerequisites (e.g., required field email) but the schema covers that. For a bulk import tool, this is reasonably 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 description coverage is 100%, so both parameters are already documented. The description restates the max count and update behavior but does not add further detail beyond the schema. Baseline 3 is appropriate since schema carries the parameter burden.
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 clearly states the tool's function: bulk-import contacts with a defined limit (5,000) and update behavior. It also explicitly distinguishes from create_contact (single) and update_contact (single) by mentioning bulk import and update semantics.
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 description implies usage for bulk import ('up to 5,000 contacts') but does not explicitly contrast with single-contact tools like create_contact or update_contact. It lacks an explicit 'when to use this instead of alternatives' statement, though the bulk aspect provides implicit guidance.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
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