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@nxavis/agent-browser-mcp

@nxavis/agent-browser-mcp

by softallice
OverviewSchemaSourceRelated ServersDiscussionsAdmin
TypeScript
Local

browser_fill

Fill text input fields with specified values using a selector, enabling automated form completion on web pages.

Instructions

Fill a text input field with the specified value

Tool call template

Replace each placeholder with a value matching the input schema. Only required parameters are included; add optional parameters as needed.

{
  "id": 1,
  "jsonrpc": "2.0",
  "method": "tools/call",
  "params": {
    "arguments": {
      "selector": "<selector>",
      "value": "<value>"
    },
    "name": "browser_fill"
  }
}

Input Schema

NameRequiredDescriptionDefault
valueYesText value to fill in
selectorYesSelector for the input element
sessionIdNoBrowser session ID

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.1

TDQS

B3.1/5.0
Behavior2/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations are absent, so the description must carry the full burden of disclosing behavior. It does not state whether existing values are cleared, whether input events are triggered, or whether the element must be interactable, which are critical 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.

Conciseness5/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is a single, front-loaded sentence with no redundant or extraneous information. It is concise and efficient, earning the highest score.

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 action with full schema coverage, the description is minimally viable. However, it lacks disambiguation from browser_type and does not clarify behavior around event firing or value replacement, leaving gaps for an agent navigating a suite of many browser tools.

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 descriptions cover all three parameters at 100% coverage, providing clear meanings for value, selector, and sessionId. The tool description adds no significant semantic detail beyond the schema, so the baseline score of 3 is appropriate.

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 identifies the action ('Fill') and the target ('text input field') with the specified value. However, it does not distinguish from sibling tools like browser_type, which could also operate on inputs, so it lacks differentiation.

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?

No guidance is provided on when to use this tool versus browser_type or other input methods. It does not mention prerequisites, such as element visibility, or any exclusions, leaving the agent to infer usage context.

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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