mcp-playwright-automation

Server Quality Checklist

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Latest release: v1.0.0
Disambiguation5/5
Each tool targets a distinct browser action: navigation, clicking, form filling, data extraction, content retrieval, and screenshots. No overlap in purpose, so agents can clearly differentiate.
Naming Consistency2/5
Naming mixes conventions: snake_case verbs (navigate, click, screenshot) and camelCase verb_noun (fillForm, extractData, getPageContent). The pattern is inconsistent, with some tools using single verbs and others using verb_noun, and differing case styles.
Tool Count5/5
Six tools form a tight, well-scoped set for basic browser automation, each earning its place. This is within the ideal 3-15 range.
Completeness3/5
The surface covers core browsing workflows (navigate, interact, extract, screenshot) but lacks common operations like waiting for elements, hovering, selecting options, or scrolling. Basic tasks are possible, but advanced automation scenarios would require workarounds.
Average 3.1/5 across 6 of 6 tools scored.
See the Tool Scores section below for per-tool breakdowns.
- No community issues in the last 6 months
- 2 commits in the last 12 weeks
- No stable releases found
- No critical vulnerability alerts
- No high-severity vulnerability alerts
- No code scanning findings
- CI is passing
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How is the quality score calculated?

The overall quality score combines two components: Tool Definition Quality (70%) and Server Coherence (30%).

Tool Definition Quality measures how well each tool describes itself to AI agents. Every tool is scored 1–5 across six dimensions: Purpose Clarity (25%), Usage Guidelines (20%), Behavioral Transparency (20%), Parameter Semantics (15%), Conciseness & Structure (10%), and Contextual Completeness (10%). The server-level definition quality score is calculated as 60% mean TDQS + 40% minimum TDQS, so a single poorly described tool pulls the score down.

Server Coherence evaluates how well the tools work together as a set, scoring four dimensions equally: Disambiguation (can agents tell tools apart?), Naming Consistency, Tool Count Appropriateness, and Completeness (are there gaps in the tool surface?).

Tiers are derived from the overall score: A (≥3.5), B (≥3.0), C (≥2.0), D (≥1.0), F (<1.0). B and above is considered passing.

Tool Scores

Behavior1/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It only says 'takes a screenshot' without revealing whether it captures the full page, waits for resources, scrolls, or has any side effects. This is a significant gap for a tool that likely affects browser state.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness3/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single short sentence with no fluff, which is concise. However, it is under-specified rather than efficiently structured—it lacks any supporting context or organization that would help an agent use it correctly.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness2/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a browser automation tool, this description is incomplete. It does not specify the output format, whether the screenshot is saved automatically, or any prerequisites like waiting for the page to load. Given the sibling tools and the absence of an output schema, more detail is necessary for correct invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% (only one parameter, filename, is fully described in the schema). The description adds no extra meaning beyond what the schema already provides, so the baseline of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description states a clear verb and resource: 'Takes a screenshot of the page'. This distinguishes it from sibling tools like navigate or click, which have different purposes. However, it lacks specificity about scope (e.g., viewport vs. full-page) or any caveats, so it is clear but minimal.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance on when to use this tool versus alternatives. It does not mention prerequisites like a loaded page, nor does it suggest any exclusions. The description simply states what it does without context.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of disclosing behavior. It only states 'Fills a form field' but does not explain whether existing text is replaced, whether events are triggered, or what side effects occur. This is a significant gap for a mutation tool.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness4/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single five-word sentence with zero filler and the core verb front-loaded. It is concise, though arguably too sparse for the overall completeness needed.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness2/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple mutation tool with no annotations, no output schema, and only two parameters, the description is minimally viable but incomplete. It omits behavioral context and usage selection guidance, which an agent would need to call it reliably.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The input schema covers 100% of parameters, each with a clear description ('CSS selector of the field', 'Text to fill in'). The tool description adds no additional meaning beyond the schema, so the baseline of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description says 'Fills a form field' — a specific verb and resource that clearly distinguishes it from siblings like 'navigate', 'click', and 'getPageContent'. It is not as rich as it could be, but the core purpose is immediately understandable.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance on when to use this tool versus alternatives. The description does not mention any context, prerequisites, or exclusions, leaving the agent to infer the appropriate use case from the tool name alone.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It reveals the action but not possible side effects like page navigation, waiting behavior, or error handling when the selector does not match an element.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, direct sentence with no filler. It front-loads the action and the object, making it appropriately concise for a simple one-parameter tool.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a basic one-parameter click tool, the description is minimally adequate. However, without annotations or an output schema, it does not explain return behavior, post-click effects, or failure conditions, leaving some important context to inference.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema description coverage is 100% and the single parameter is already documented as 'CSS selector of the element'. The tool description adds no extra meaning about how the selector should be crafted or used, so the baseline score of 3 applies.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states a specific action ('Clicks') and object ('an element on the page'), and it is readily distinguishable from sibling tools like navigate, fillForm, and extractData. It lacks additional scoping detail, but the core purpose is unambiguous.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance on when to use click versus alternatives such as fillForm or navigate. The description only states what the tool does, not when it should be selected or when it should be avoided.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
No annotations are provided, so the description carries the full burden of behavioral disclosure. It only states the basic action and does not mention whether the operation is read-only, what happens if the selector matches no element, or whether it returns the first match or an array. For a simple extraction tool, the lack of detail about return behavior and edge cases leaves the agent with uncertainty.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence with no filler. It states the core purpose immediately and omits any irrelevant details. This is appropriately sized for a tool with one parameter and no annotations.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
Given the tool's simplicity (one parameter, no output schema, no annotations), the description is partially complete. It conveys the fundamental function but omits details about the exact return value (e.g., innerText vs textContent), behavior on missing elements, and confirms it is a read-only operation. These gaps are noticeable because there is no output schema to clarify the result shape.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
Schema coverage is 100% and the only parameter (selector) already has a clear description in the schema ('CSS selector of the element'). The tool description adds no additional meaning or usage nuance beyond that, so the baseline of 3 applies. No extra examples, format constraints, or guidance are provided.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description clearly states the action (extracts) and the target (text of an element on the page). It implies a focused, element-specific extraction that distinguishes it from getPageContent, though it doesn't explicitly name the sibling. The verb and resource are specific enough for basic selection.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines3/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The description implicitly tells an agent to use this tool when they need the text of a specific page element, as opposed to the full page content. However, it provides no explicit when-to-use or when-not-to-use guidance, nor does it mention any alternatives or prerequisites. The usage context is inferred rather than stated.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior2/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations provided, the description carries the full burden of behavioral disclosure. It only states 'navigates' without mentioning what happens after navigation, whether it waits for page load, handles errors, or modifies the current page state in a way an agent should know about.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
The description is a single, front-loaded sentence with no filler. It succinctly communicates the core action and the only parameter, making it appropriately sized for a one-parameter tool.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness3/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple single-parameter tool, the description is mostly adequate for invoking the tool. However, with no output schema and no annotations, it leaves the expected return value or post-navigation behavior unspecified, which is a gap in completeness.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters3/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The schema already covers the one parameter comprehensively with a description for 'url.' The tool description adds no meaningful parameter semantics beyond what the schema provides, so it stays at the baseline for high schema coverage.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description states a clear action and resource: 'Navigates to a specific URL.' It is specific enough to convey the tool's function, though it does not explicitly distinguish itself from sibling tools like getPageContent or click beyond the core navigation verb.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines3/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
The usage is implied: use this tool when you want to navigate to a URL. However, it does not provide explicit guidance on when not to use it, mention prerequisites, or contrast it with alternative tools such as click or fillForm.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.
Behavior3/5
Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?
With no annotations, the description carries the full burden. 'Gets' conveys a read-only operation, but no further detail is given about side effects, whether it operates on the current page, or the exact response shape. It is minimally transparent but not detailed.
Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.
Conciseness5/5
Is the description appropriately sized, front-loaded, and free of redundancy?
A single sentence with no filler. The key scoping term 'full HTML content' is front-loaded, and every word adds meaning.
Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.
Completeness5/5
Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?
For a simple parameterless getter with no output schema, the description adequately conveys what the agent will receive and how to call it. Nothing essential is missing for correct invocation.
Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.
Parameters4/5
Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?
The tool has zero parameters and 100% schema description coverage, so there is nothing for the description to add. The baseline of 4 for a parameterless tool applies here.
Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.
Purpose4/5
Does the description clearly state what the tool does and how it differs from similar tools?
The description uses a specific verb ('gets') and a specific resource ('full HTML content of the page'), so an agent can tell it is meant for raw page retrieval rather than structured extraction or screenshots. It does not explicitly name sibling alternatives, but the scope is still clear.
Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.
Usage Guidelines2/5
Does the description explain when to use this tool, when not to, or what alternatives exist?
There is no guidance about when to use this tool versus siblings such as extractData or screenshot. The description only states what it does; an agent must infer the appropriate use case with no exclusions or alternatives provided.
Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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