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Chrome DevTools: tool descriptions scored

tools/list taken
(UTC)
From
npm chrome-devtools-mcp@1.10.1
Homepage
github.com
Scoring rules
v2

Scores, issues and names only

This page shows how Chrome DevTools'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.

A server with a public URL can be scored as it is today: score from a URL

servers/chrome-devtools
Average score
45.1 / 100Cloudy
Tools
30
Near-identical descriptions
0

Across the server

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

drag

31 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
18 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description only restates the name (6 words).restates_name
  • Major
    The description is too short (6 words).too_short
  • 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: pageId, from_uid, to_uid. Name the tool or the place that returns it, or models look it up first.id_source_missing

hover

31 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
18 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description only restates the name (5 words).restates_name
  • Major
    The description is too short (5 words).too_short
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

upload_file

31 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
18 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description only restates the name (7 words).restates_name
  • Major
    The description is too short (7 words).too_short
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

click

35 / 100Rain

Purpose
10 / 20
When to use
0 / 20
Arguments
18 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description is too short (5 words).too_short
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

type_text

36 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
18 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
5 / 10
  • Major
    The description only restates the name (9 words).restates_name
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

list_pages

38 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
25 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description only restates the name (9 words).restates_name
  • 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

take_screenshot

38 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
5 / 10
  • Major
    The description only restates the name (8 words).restates_name
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

handle_dialog

41 / 100Cloudy

Purpose
14 / 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
    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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

navigate_page

41 / 100Cloudy

Purpose
14 / 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
    Says nothing about what it returns.no_return_info
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

emulate

42 / 100Cloudy

Purpose
10 / 20
When to use
0 / 20
Arguments
20 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
5 / 10
  • Major
    The description is too short (7 words).too_short
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

list_console_messages

42 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
18 / 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
    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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

new_page

42 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
18 / 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

performance_stop_trace

43 / 100Cloudy

Purpose
13 / 20
When to use
0 / 20
Arguments
18 / 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
    Says nothing about what it returns.no_return_info
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

select_page

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

wait_for

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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

close_page

44 / 100Cloudy

Purpose
14 / 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

get_console_message

44 / 100Cloudy

Purpose
14 / 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

list_network_requests

44 / 100Cloudy

Purpose
14 / 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
    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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

performance_analyze_insight

44 / 100Cloudy

Purpose
14 / 20
When to use
0 / 20
Arguments
18 / 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 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: pageId, insightSetId. Name the tool or the place that returns it, or models look it up first.id_source_missing

resize_page

44 / 100Cloudy

Purpose
14 / 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
    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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

take_heapsnapshot

44 / 100Cloudy

Purpose
14 / 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

fill

47 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
18 / 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 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

lighthouse_audit

50 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
21 / 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 description mentions none of its 3 or more arguments.params_not_in_description
  • Minor
    Says nothing about what it returns.no_return_info

evaluate_script

51 / 100Cloudy

Purpose
14 / 20
When to use
0 / 20
Arguments
18 / 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
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

get_network_request

54 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
18 / 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
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

performance_start_trace

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
    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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

get_css_styles

60 / 100Cloudy

Purpose
20 / 20
When to use
5 / 20
Arguments
18 / 25
Return value
7 / 15
Constraints and side effects
10 / 10
Examples
0 / 10
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

take_snapshot

60 / 100Cloudy

Purpose
20 / 20
When to use
15 / 20
Arguments
18 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • 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: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

press_key

62 / 100Cloudy

Purpose
17 / 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
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. Name the tool or the place that returns it, or models look it up first.id_source_missing

fill_form

72 / 100Clear

Purpose
17 / 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
  • Minor
    Required identifiers whose description does not say where the value comes from: pageId. 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.

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.

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