# Mail Blaze MCP by usefulapi (io.usefulapi/mailblaze): tool descriptions scored

- tools/list taken: 2026-11-02 (UTC)
- From: [Official MCP Registry](https://registry.modelcontextprotocol.io/v0/servers/io.usefulapi%2Fmailblaze/versions/latest)
- Connected to: https://mailblaze.usefulapi.io/mcp
- Homepage: https://usefulapi.io/mailblaze/
- Repository: https://github.com/m190/usefulapi-mcp
- Scoring rules: v2
- Tools: 26
- Average: 43.5 / 100 (Cloudy)
- Near-identical pairs: 1

This page shows how Mail Blaze MCP by usefulapi (io.usefulapi/mailblaze)'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: 26 tools. Above 25, models start to tell tools apart less well.

## Tools

- `mailblaze_get_template`: 21 / 100
  - Major: The description only restates the name (9 words).
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: template_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: template_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_transactional_email`: 28 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: email_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: email_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_campaign`: 32 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: campaign_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: campaign_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_campaign_inbox_breakdown`: 34 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: campaign_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: campaign_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_find_subscriber_by_email`: 36 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Major: Arguments without a description: list_uid, email.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_subscriber_activity`: 37 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: email, list_uid.
  - Minor: Says nothing about what it returns.
- `mailblaze_get_subscriber`: 40 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: list_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid, subscriber_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_list_subscribers`: 40 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: list_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_resubscribe_subscriber`: 40 / 100
  - Major: Arguments without a description: list_uid, subscriber_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid, subscriber_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_list_campaign_events`: 43 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: campaign_uid, kind.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: campaign_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_report_job`: 44 / 100
  - Major: Arguments without a description: job_id.
- `mailblaze_list_campaigns`: 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.
- `mailblaze_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.
- `mailblaze_list_templates`: 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.
- `mailblaze_list_transactional_emails`: 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.
- `mailblaze_create_template`: 45 / 100
  - Minor: Arguments without a description: name.
  - Minor: Says nothing about what it returns.
- `mailblaze_list_segments`: 45 / 100
  - Minor: Arguments without a description: list_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_list`: 47 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_list_list_fields`: 48 / 100
  - Minor: Arguments without a description: list_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_add_subscriber`: 49 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Arguments without a description: list_uid, email.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_add_subscribers_bulk`: 50 / 100
  - Major: Arguments without a description: list_uid, subscribers[].email, subscribers[].first_name, subscribers[].last_name.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_unsubscribe_subscriber`: 50 / 100
  - Major: Arguments without a description: list_uid, subscriber_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid, subscriber_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_get_campaign_summaries`: 53 / 100
  - Major: Says nothing about when to use it, or when not to.
  - Minor: Says nothing about what it returns.
- `mailblaze_create_campaign`: 55 / 100
  - Major: Arguments without a description: from_name, reply_to, subject, list_uid, template_uid.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid, template_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_update_subscriber`: 55 / 100
  - Major: Arguments without a description: list_uid, subscriber_uid, first_name, last_name.
  - Minor: Says nothing about what it returns.
  - Minor: Required identifiers whose description does not say where the value comes from: list_uid, subscriber_uid. Name the tool or the place that returns it, or models look it up first.
- `mailblaze_send_transactional_email`: 62 / 100
  - Minor: Arguments without a description: to_email, reply_to_email, reply_to_name, subject.
  - Minor: Says nothing about what it returns.

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