# Sendlane MCP by usefulapi (io.usefulapi/sendlane): tool descriptions scored

- tools/list taken: 2026-11-02 (UTC)
- From: [Official MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.usefulapi%2Fsendlane/versions/latest)
- Connected to: https://sendlane.usefulapi.io/mcp
- Homepage: https://usefulapi.io/sendlane/
- Repository: https://github.com/m190/usefulapi-mcp
- Scoring rules: v2
- Tools: 31
- Average: 35.5 / 100 (Rain)
- Near-identical pairs: 8

This page shows how Sendlane MCP by usefulapi (io.usefulapi/sendlane)'s tool descriptions scored, the issues found and the names of its tools and parameters. The descriptions are the server's own: read them where the copy came from.

Forecall asked the URL this server lists in the official MCP Registry for its tools/list once, on the date above, without calling any tool. The server may have changed since.

## Across the server

- Minor: 31 tools. Above 25, models start to tell tools apart less well.

## Tools

- `sendlane_create_tag`: 21 / 100
  - Major: The description only restates the name (7 words).
  - Major: The description is too short (7 words).
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: name.
  - Minor: Says nothing about what it returns.
- `sendlane_get_campaign`: 21 / 100
  - Major: The description only restates the name (8 words).
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: campaign_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: campaign_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_get_list`: 21 / 100
  - Major: The description only restates the name (8 words).
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: list_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_get_tag`: 21 / 100
  - Major: The description only restates the name (7 words).
  - Major: The description is too short (7 words).
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: tag_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: tag_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_get_contact`: 29 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: contact_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_get_contact_tags`: 31 / 100
  - Major: The description only restates the name (9 words).
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: contact_id.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_add_contact_tags`: 32 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: contact_id, tag_ids.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id, tag_ids. Name the tool or the place that returns it, or models look it up first.
- `sendlane_remove_contact_from_list`: 32 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: list_id, contact_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_id, contact_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_remove_contact_tag`: 32 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: contact_id, tag_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id, tag_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_unsubscribe_contact`: 32 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: contact_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_update_list`: 32 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: list_id, name, description.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_get_contact_subscriptions`: 34 / 100
  - Major: Arguments without a description: contact_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_create_list`: 35 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: name, description.
  - Minor: Says nothing about what it returns.
- `sendlane_get_contact_custom_fields`: 35 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: contact_id.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: contact_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_set_contact_custom_fields`: 36 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: contact_id, custom_fields, custom_fields[].value.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
- `sendlane_list_list_unsubscribed`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: list_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_list_tag_contacts`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: tag_id.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: tag_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_list_unsubscribed_contacts`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_segment_contacts`: 39 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: segment_id.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: segment_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_list_campaigns`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_contacts`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_list_contacts`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: list_id.
  - Minor: The description mentions none of its 3 or more arguments.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_list_segments`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_sender_profiles`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_sms_messages`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_tags`: 41 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_get_campaign_report`: 42 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: campaign_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: campaign_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_get_sms_report`: 42 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: message_id.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: message_id. Name the tool or the place that returns it, or models look it up first.
- `sendlane_list_lists`: 44 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_list_custom_fields`: 46 / 100
  - Minor: No `required` list, so every argument is optional.
  - Minor: Says nothing about what it returns.
- `sendlane_add_contacts_to_list`: 47 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: list_id, contacts, contacts[].first_name, contacts[].last_name, contacts[].custom_fields, contacts[].custom_fields[].value.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_id. Name the tool or the place that returns it, or models look it up first.

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