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Agent.ai MCP Server

Agent.ai MCP Server

by OnStartups
OverviewSchemaSourceRelated ServersDiscussionsAdmin
JavaScript
Remote

file_converter_watermark_action

Add a text watermark like 'CONFIDENTIAL' or 'DRAFT' to PDF or image files to protect sensitive documents.

Instructions

Add a text watermark (e.g. CONFIDENTIAL, DRAFT) to a PDF or image file.

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": {
      "input_file_url": "<input_file_url>",
      "input_format": "<input_format>",
      "text": "<text>",
      "output_variable_name": "<output_variable_name>"
    },
    "name": "file_converter_watermark_action"
  }
}

Input Schema

NameRequiredDescriptionDefault
input_file_urlYesS3 or public URL of the file to watermark.
input_formatYesExtension of the input file (e.g. pdf, png, jpg).pdf
textYesText to overlay (e.g. CONFIDENTIAL, DRAFT).
output_variable_nameYesVariable name for the result.watermarked_file

Schema Changelog

Changes observed during successful MCP inspections.

  1. First observedv0.1.0

TDQS

B3.3/5.0
Behavior2/5

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

No annotations are provided, so the description burdens full behavioral disclosure. It only states the core function without revealing side effects, such as file overwriting, permission needs, or result storage. This minimal disclosure is insufficient for safe autonomous use.

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 sentence that is direct and free of redundancy. Every word contributes to conveying the tool's purpose, making it highly concise.

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 utility tool with full schema coverage and no output schema, the description adequately covers the core action. However, it lacks details on limitations (e.g., text size, font, positioning) and result handling, which would improve completeness given the complex sibling context.

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%, so baseline 3 applies. The description adds no extra parameter context beyond the schema's already clear descriptions. It neither enhances nor detracts from the schema's clarity.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description clearly states the action: 'Add a text watermark' to 'a PDF or image file', specifying the resource and examples like CONFIDENTIAL, DRAFT. This distinguishes it from sibling tools such as file_converter_convert_action or file_converter_encrypt_action.

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?

The description provides no guidance on when to use this tool versus alternatives. Among many sibling tools (e.g., file_converter_convert_action, file_converter_merge_action), there is no mention of conditions or exclusions, leaving the agent without decision support.

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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