Project Gumball: tool descriptions scored com.gumballtools/platform

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

Scores, issues and names only

This page shows how Project Gumball (com.gumballtools/platform)'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/com.gumballtools/platform

Average score: 65.4 / 100Cloudy
Tools: 25
Near-identical descriptions: 0

Across the server

Minor
The server has no instructions. Say there, once, what the server is for and when to use it: Claude Code and Gemini CLI read the instructions before the tool descriptions.instructions_missing

Tools

vocab_draw

47 / 100Cloudy

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 13 / 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
Arguments without a description: difficulty, theme.param_no_description
Minor
No `required` list, so every argument is optional.no_required

vocab_check

50 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 18 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 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: id. Name the tool or the place that returns it, or models look it up first.id_source_missing

validate_xml

52 / 100Cloudy

Purpose: 17 / 20
When to use: 5 / 20
Arguments: 18 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Says nothing about what it returns.no_return_info

regex_explain

55 / 100Cloudy

Purpose: 20 / 20
When to use: 5 / 20
Arguments: 18 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Says nothing about what it returns.no_return_info

validate_yaml

57 / 100Cloudy

Purpose: 17 / 20
When to use: 10 / 20
Arguments: 18 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Says nothing about what it returns.no_return_info

validate_json

59 / 100Cloudy

Purpose: 17 / 20
When to use: 5 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

No issues.

offside

61 / 100Cloudy

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

Minor
Arguments without a description: sport, situation.param_no_description

round_cash_total

61 / 100Cloudy

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

Minor
Arguments without a description: rule.param_no_description
Minor
Says nothing about what it returns.no_return_info

json_to_types

62 / 100Cloudy

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

No issues.

rounding_impact

62 / 100Cloudy

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

Major
Arguments without a description: taxRatePercent, rule.param_no_description
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

check_digit_run

64 / 100Cloudy

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

Minor
Says nothing about what it returns.no_return_info

color_analyse

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
Says nothing about what it returns.no_return_info

offside_rule_contrast

66 / 100Cloudy

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

No issues.

validate_csv

66 / 100Cloudy

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

No issues.

iso_week_run

67 / 100Cloudy

Purpose: 17 / 20
When to use: 20 / 20
Arguments: 18 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Says nothing about what it returns.no_return_info

amortize_schedule

69 / 100Cloudy

Purpose: 17 / 20
When to use: 15 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Arguments without a description: dayCountBasis, paymentFrequency.param_no_description

cron_build

70 / 100Clear

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

Minor
Says nothing about what it returns.no_return_info

body_metrics

72 / 100Clear

Purpose: 20 / 20
When to use: 15 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

Minor
Arguments without a description: targetBmi.param_no_description

timezone_convert

72 / 100Clear

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

No issues.

equation_steps_run

74 / 100Clear

Purpose: 17 / 20
When to use: 15 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

No issues.

validate_auto

74 / 100Clear

Purpose: 17 / 20
When to use: 20 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 5 / 10

No issues.

cron_explain

75 / 100Clear

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

Minor
Says nothing about what it returns.no_return_info

due_date

78 / 100Clear

Purpose: 20 / 20
When to use: 15 / 20
Arguments: 19 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

No issues.

cron_next_runs

79 / 100Clear

Purpose: 17 / 20
When to use: 20 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

No issues.

price_band

79 / 100Clear

Purpose: 17 / 20
When to use: 20 / 20
Arguments: 18 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 10 / 10

Minor
The description mentions none of its 3 or more arguments.params_not_in_description

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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