Rinkel MCP by usefulapi: tool descriptions scored io.usefulapi/rinkel

tools/list taken: 2026-11-02 (UTC)
From: Official MCP Registry
Connected to: https://rinkel.usefulapi.io/mcp
Homepage: usefulapi.io/rinkel/
Repository: github.com/m190/usefulapi-mcp
Scoring rules: v2
Removal: support@forecall.dev

Scores, issues and names only

This page shows how Rinkel MCP by usefulapi (io.usefulapi/rinkel)'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.

servers/io.usefulapi/rinkel

Average score: 56.1 / 100Cloudy
Tools: 27
Near-identical descriptions: 0

Across the server

Minor
27 tools. Above 25, models start to tell tools apart less well.many_tools

Tools

rinkel_get_contact

43 / 100Cloudy

Purpose: 13 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info
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.id_source_missing

rinkel_count_new_voicemails

46 / 100Cloudy

Purpose: 14 / 20
When to use: 0 / 20
Arguments: 25 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info

rinkel_create_contact

47 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 15 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Arguments without a description: first_name, last_name, company_name, email.param_no_description
Minor
Says nothing about what it returns.no_return_info

rinkel_list_recordings

47 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 20 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
No `required` list, so every argument is optional.no_required
Minor
The description mentions none of its 3 or more arguments.params_not_in_description
Minor
Says nothing about what it returns.no_return_info

rinkel_list_contacts

49 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 17 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
No `required` list, so every argument is optional.no_required
Minor
The description mentions none of its 3 or more arguments.params_not_in_description
Minor
Says nothing about what it returns.no_return_info

rinkel_list_numbers

49 / 100Cloudy

Purpose: 17 / 20
When to use: 0 / 20
Arguments: 25 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info

rinkel_list_webhooks

49 / 100Cloudy

Purpose: 17 / 20
When to use: 0 / 20
Arguments: 25 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info

rinkel_get_number

50 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: number_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_unblock_number

50 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info

rinkel_get_user

52 / 100Cloudy

Purpose: 17 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
The meaning of the boolean argument include_avatar is unclear.vague_boolean
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: user_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_list_users

52 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 20 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
No `required` list, so every argument is optional.no_required
Minor
The meaning of the boolean argument include_avatars is unclear.vague_boolean
Minor
Says nothing about what it returns.no_return_info

rinkel_list_voicemails

52 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
No `required` list, so every argument is optional.no_required

rinkel_find_contact_by_number

57 / 100Cloudy

Purpose: 17 / 20
When to use: 5 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Says nothing about what it returns.no_return_info

rinkel_delete_contact

58 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 10 / 10
Examples: 0 / 10

Minor
Says nothing about what it returns.no_return_info
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.id_source_missing

rinkel_update_contact

58 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 16 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Minor
Arguments without a description: first_name, last_name, company_name, email.param_no_description
Minor
Says nothing about what it returns.no_return_info
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.id_source_missing

rinkel_add_call_note

60 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: call_record_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_delete_call_note

60 / 100Cloudy

Purpose: 17 / 20
When to use: 5 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 10 / 10
Examples: 5 / 10

Minor
Says nothing about what it returns.no_return_info

rinkel_get_call

60 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: call_record_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_get_call_by_network_id

60 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: network_call_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_get_voicemail_url

60 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: voicemail_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_update_call_note

60 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context
Minor
The description mentions none of its 3 or more arguments.params_not_in_description
Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: call_record_id, note_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_validate_phone_number

62 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 23 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Major
Says nothing about when to use it, or when not to.no_usage_context

rinkel_block_number

65 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Minor
Says nothing about what it returns.no_return_info

rinkel_get_call_transcription

65 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: network_call_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_list_calls

65 / 100Cloudy

Purpose: 20 / 20
When to use: 10 / 20
Arguments: 18 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Minor
No `required` list, so every argument is optional.no_required
Minor
The description mentions none of its 3 or more arguments.params_not_in_description
Minor
Says nothing about what it returns.no_return_info

rinkel_start_call

68 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 10 / 10
Examples: 10 / 10

Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: device_id, number_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

rinkel_get_call_recording_url

70 / 100Clear

Purpose: 20 / 20
When to use: 10 / 20
Arguments: 23 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Minor
Says nothing about what it returns.no_return_info
Minor
Required identifiers whose description does not say where the value comes from: call_recording_id. Name the tool or the place that returns it, or models look it up first.id_source_missing

What static scoring cannot tell

This score reads only the text of each description and schema: it says what is written, not what a model will do. Short tools whose names already say what they do, such as browser_close, score low here even when models use them well, and in our measurements current models chose the right tool in one step even from one-line descriptions, as long as the names and schemas differed. What the text cannot show, such as what happens over several steps and whether an added sentence helps or misleads, is what an evaluation measures, on the Pro and Team plans.

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