Penny Engine — Agent Operations: tool descriptions scored io.github.kasheik3/penny-engine

tools/list taken: 2026-11-02 (UTC)
From: Official MCP Registry
Connected to: https://penny-agent-api-production.up.railway.app/mcp
Scoring rules: v2
Removal: support@forecall.dev

Scores, issues and names only

This page shows how Penny Engine — Agent Operations (io.github.kasheik3/penny-engine)'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.github.kasheik3/penny-engine

Average score: 35.4 / 100Rain
Tools: 18
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

penny_csv_to_json

26 / 100Rain

Purpose: 14 / 20
When to use: 0 / 20
Arguments: 5 / 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
Major
Arguments without a description: csv.param_no_description
Minor
String arguments with no constraint or example: csv.loose_string_param
Minor
Says nothing about what it returns.no_return_info

penny_slugify

26 / 100Rain

Purpose: 14 / 20
When to use: 0 / 20
Arguments: 5 / 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
Major
Arguments without a description: text.param_no_description
Minor
String arguments with no constraint or example: text.loose_string_param
Minor
Says nothing about what it returns.no_return_info

penny_margin

27 / 100Rain

Purpose: 10 / 20
When to use: 0 / 20
Arguments: 10 / 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
Major
Arguments without a description: price, variableCost, fixedCost.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

penny_subscription_ltv

27 / 100Rain

Purpose: 10 / 20
When to use: 0 / 20
Arguments: 10 / 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
Major
Arguments without a description: pricePerMonth, monthlyChurnPct, grossMarginPct, acquisitionCostUsd.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

penny_html_extract

29 / 100Rain

Purpose: 17 / 20
When to use: 0 / 20
Arguments: 5 / 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
Major
Arguments without a description: html.param_no_description
Minor
String arguments with no constraint or example: html.loose_string_param
Minor
Says nothing about what it returns.no_return_info

penny_json_inspect

29 / 100Rain

Purpose: 17 / 20
When to use: 0 / 20
Arguments: 5 / 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
Major
Arguments without a description: text.param_no_description
Minor
String arguments with no constraint or example: text.loose_string_param
Minor
Says nothing about what it returns.no_return_info

penny_url_clean

29 / 100Rain

Purpose: 17 / 20
When to use: 0 / 20
Arguments: 5 / 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
Major
Arguments without a description: url, removeAllQuery.param_no_description
Minor
String arguments with no constraint or example: url.loose_string_param
Minor
The meaning of the boolean argument removeAllQuery is unclear.vague_boolean
Minor
Says nothing about what it returns.no_return_info

penny_campaign_economics

30 / 100Rain

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

Major
Says nothing about when to use it, or when not to.no_usage_context
Major
Arguments without a description: costPerClick, conversionRatePct, contributionPerOrderUsd.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

penny_cleaning_quote

31 / 100Rain

Purpose: 14 / 20
When to use: 0 / 20
Arguments: 10 / 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
Major
Arguments without a description: hours, hourlyWage, laborBurdenPct, suppliesUsd, overheadUsd, targetMarginPct.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

penny_marketplace_profit

36 / 100Rain

Purpose: 14 / 20
When to use: 5 / 20
Arguments: 10 / 25
Return value: 0 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Arguments without a description: salePrice, productCost, shippingCost, shippingCharged, platformFeePct, platformFeeFixed, adCost.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

penny_capability_router

37 / 100Rain

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 10 / 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
Major
Arguments without a description: task.param_no_description
Minor
Says nothing about what it returns.no_return_info

penny_catalog_audit

37 / 100Rain

Purpose: 20 / 20
When to use: 0 / 20
Arguments: 10 / 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
Major
Arguments without a description: items, items[].sku, items[].name, items[].price, items[].cost, items[].shippingCost, items[].feePct, items[].url, targetMarginPct.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

penny_catalog_import_guard

41 / 100Cloudy

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

Major
Arguments without a description: current, current[].sku, current[].name, current[].price, current[].currency, current[].stock, current[].url, previous, previous[].sku, previous[].name, previous[].price, previous[].currency, previous[].stock, previous[].url, maxPriceChangePct, maxStockDropPct, allowNewProducts.param_no_description
Minor
String arguments with no constraint or example: current[].sku, current[].name, current[].currency, current[].url, previous[].sku, previous[].name, previous[].currency, previous[].url.loose_string_param
Minor
The meaning of the boolean argument allowNewProducts is unclear.vague_boolean

penny_choose_service

42 / 100Cloudy

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

Major
Says nothing about when to use it, or when not to.no_usage_context
Major
Arguments without a description: task, maxPriceUsd.param_no_description
Minor
Says nothing about what it returns.no_return_info

penny_target_price

42 / 100Cloudy

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

Major
Arguments without a description: cost, feePct, feeFixed, targetMarginPct.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

penny_fulfillment_preflight

44 / 100Cloudy

Purpose: 17 / 20
When to use: 5 / 20
Arguments: 8 / 25
Return value: 7 / 15
Constraints and side effects: 7 / 10
Examples: 0 / 10

Major
Arguments without a description: goal, input, input.csv, input.targetMarginPct, input.jobs, input.jobs[].id, input.jobs[].result, input.jobs[].expectations, maxPriceUsd.param_no_description
Minor
String arguments with no constraint or example: input.jobs[].id.loose_string_param
Minor
The description mentions none of its 3 or more arguments.params_not_in_description

penny_product_evidence

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
Arguments without a description: url.param_no_description

penny_trend_radar

52 / 100Cloudy

Purpose: 20 / 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

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.

Is your server listed here and you would rather it were not? Email support@forecall.dev, and we will take it off within 7 days.

All scored servers