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Playwright: tool descriptions scored

tools/list taken
(UTC)
From
npm @playwright/mcp@1.64.0-alpha
Homepage
github.com
Scoring rules
v2

Scores, issues and names only

This page shows how Playwright'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/playwright
Average score
41.9 / 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

browser_drag

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 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

browser_evaluate

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 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
    Says nothing about what it returns.no_return_info

browser_handle_dialog

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description only restates the name (3 words).restates_name
  • Major
    The description is too short (3 words).too_short
  • 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

browser_hover

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 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
    Says nothing about what it returns.no_return_info

browser_navigate

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 10
  • Major
    The description only restates the name (4 words).restates_name
  • Major
    The description is too short (4 words).too_short
  • 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

browser_select_option

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 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

browser_type

33 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
20 / 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
    Says nothing about what it returns.no_return_info

browser_click

35 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
22 / 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

browser_tabs

35 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
22 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
0 / 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

browser_close

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 (3 words).restates_name
  • Major
    The description is too short (3 words).too_short
  • 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

browser_press_key

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 (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
    Says nothing about what it returns.no_return_info

browser_resize

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 (4 words).restates_name
  • Major
    The description is too short (4 words).too_short
  • 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

browser_snapshot

38 / 100Rain

Purpose
14 / 20
When to use
0 / 20
Arguments
17 / 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

browser_fill_form

39 / 100Rain

Purpose
6 / 20
When to use
0 / 20
Arguments
21 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
5 / 10
  • Major
    The description only restates the name (4 words).restates_name
  • Major
    The description is too short (4 words).too_short
  • Major
    Says nothing about when to use it, or when not to.no_usage_context
  • Minor
    String arguments with no constraint or example: fields[].name.loose_string_param
  • Minor
    Says nothing about what it returns.no_return_info

browser_wait_for

41 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
17 / 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
    Says nothing about what it returns.no_return_info

browser_file_upload

42 / 100Cloudy

Purpose
13 / 20
When to use
0 / 20
Arguments
22 / 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
    No `required` list, so every argument is optional.no_required
  • Minor
    Says nothing about what it returns.no_return_info

browser_navigate_back

42 / 100Cloudy

Purpose
10 / 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

browser_run_code_unsafe

46 / 100Cloudy

Purpose
17 / 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
    Says nothing about what it returns.no_return_info

browser_console_messages

47 / 100Cloudy

Purpose
6 / 20
When to use
0 / 20
Arguments
22 / 25
Return value
7 / 15
Constraints and side effects
7 / 10
Examples
5 / 10
  • Major
    The description only restates the name (4 words).restates_name
  • Major
    The description is too short (4 words).too_short
  • Major
    Says nothing about when to use it, or when not to.no_usage_context

browser_emulate_media

51 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
22 / 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
    Says nothing about what it returns.no_return_info

browser_take_screenshot

51 / 100Cloudy

Purpose
17 / 20
When to use
0 / 20
Arguments
22 / 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

browser_network_requests

53 / 100Cloudy

Purpose
14 / 20
When to use
0 / 20
Arguments
20 / 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
    The description mentions none of its 3 or more arguments.params_not_in_description

browser_network_request

55 / 100Cloudy

Purpose
14 / 20
When to use
0 / 20
Arguments
22 / 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

browser_drop

62 / 100Cloudy

Purpose
20 / 20
When to use
5 / 20
Arguments
20 / 25
Return value
0 / 15
Constraints and side effects
7 / 10
Examples
10 / 10
  • Minor
    Says nothing about what it returns.no_return_info

browser_find

66 / 100Cloudy

Purpose
20 / 20
When to use
5 / 20
Arguments
17 / 25
Return value
7 / 15
Constraints and side effects
7 / 10
Examples
10 / 10
  • Minor
    No `required` list, so every argument is optional.no_required

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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