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pdfdotco

PDF.co MCP Server

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by pdfdotco

pdf_merge

Merge multiple files (PDF, DOC, XLS, images, ZIP) into a single PDF document using URLs or uploaded files.

Instructions

Merge PDF from two or more PDF, DOC, XLS, images, even ZIP with documents and images into a new PDF.
Ref: https://developer.pdf.co/api-reference/merge/various-files.md

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlYesURLs to the source files as a comma-separated list. Supports PDF, DOC, DOCX, RTF, TXT, XLS, XLSX, CSV, images, and more. Supports publicly accessible links including Google Drive, Dropbox, PDF.co Built-In Files Storage. Use 'upload_file' tool to upload local files.
httpusernameNoHTTP auth user name if required to access source url. (Optional)
httppasswordNoHTTP auth password if required to access source url. (Optional)
nameNoFile name for the generated output. (Optional)
api_keyNoPDF.co API key. If not provided, will use X_API_KEY environment variable. (Optional)

Implementation Reference

  • The main MCP tool handler for 'pdf_merge' - an async function decorated with @mcp.tool() that accepts url, httpusername, httppassword, name, and api_key parameters. It delegates to the merge_pdf service function via ConversionParams.
    @mcp.tool()
    async def pdf_merge(
        url: str = Field(
            description="URLs to the source files as a comma-separated list. Supports PDF, DOC, DOCX, RTF, TXT, XLS, XLSX, CSV, images, and more. Supports publicly accessible links including Google Drive, Dropbox, PDF.co Built-In Files Storage. Use 'upload_file' tool to upload local files."
        ),
        httpusername: str = Field(
            description="HTTP auth user name if required to access source url. (Optional)",
            default="",
        ),
        httppassword: str = Field(
            description="HTTP auth password if required to access source url. (Optional)",
            default="",
        ),
        name: str = Field(
            description="File name for the generated output. (Optional)", default=""
        ),
        api_key: str = Field(
            description="PDF.co API key. If not provided, will use X_API_KEY environment variable. (Optional)",
            default="",
        ),
    ) -> BaseResponse:
        """
        Merge PDF from two or more PDF, DOC, XLS, images, even ZIP with documents and images into a new PDF.
        Ref: https://developer.pdf.co/api-reference/merge/various-files.md
        """
        return await merge_pdf(
            ConversionParams(
                url=url, httpusername=httpusername, httppassword=httppassword, name=name
            ),
            api_key=api_key,
        )
  • The 'merge_pdf' helper function that the handler calls - makes an API request to the 'pdf/merge2' endpoint with the given ConversionParams and optional api_key.
    async def merge_pdf(params: ConversionParams, api_key: str | None = None) -> BaseResponse:
        return await request("pdf/merge2", params, api_key=api_key)
  • Imports registering the pdf_merge tool: imports 'mcp' from server (for @mcp.tool() decorator), 'merge_pdf' from services/pdf.py, and BaseResponse/ConversionParams from models.
    from pdfco.mcp.server import mcp
    from pdfco.mcp.services.pdf import merge_pdf, split_pdf
    from pdfco.mcp.models import BaseResponse, ConversionParams
  • The ConversionParams schema (Pydantic model) used to pass parameters to merge_pdf, and the BaseResponse schema used as the return type for pdf_merge.
    class ConversionParams(BaseModel):
        url: str = Field(
            description="URL to the source file. Supports publicly accessible links including Google Drive, Dropbox, PDF.co Built-In Files Storage. Use 'upload_file' tool to upload local files.",
            default="",
        )
        httpusername: str = Field(
            description="HTTP auth user name if required to access source url. (Optional)",
            default="",
        )
        httppassword: str = Field(
            description="HTTP auth password if required to access source url. (Optional)",
            default="",
        )
        pages: str = Field(
            description="Comma-separated page indices (e.g., '0, 1, 2-' or '1, 3-7'). Use '!' for inverted page numbers (e.g., '!0' for last page). Processes all pages if None. (Optional)",
            default="",
        )
        unwrap: bool = Field(
            description="Unwrap lines into a single line within table cells when lineGrouping is enabled. Must be true or false. (Optional)",
            default=False,
        )
        rect: str = Field(
            description="Defines coordinates for extraction (e.g., '51.8,114.8,235.5,204.0'). (Optional)",
            default="",
        )
        lang: str = Field(
            description="Language for OCR for scanned documents. Default is 'eng'. See PDF.co docs for supported languages. (Optional, Default: 'eng')",
            default="eng",
        )
        line_grouping: str = Field(
            description="Enables line grouping within table cells when set to '1'. (Optional)",
            default="0",
        )
        password: str = Field(
            description="Password of the PDF file. (Optional)", default=""
        )
        name: str = Field(
            description="File name for the generated output. (Optional)", default=""
        )
        autosize: bool = Field(
            description="Controls automatic page sizing. If true, page dimensions adjust to content. If false, uses worksheet’s page setup. (Optional)",
            default=False,
        )
    
        html: str = Field(
            description="Input HTML code to be converted. To convert the link to a PDF use the /pdf/convert/from/url endpoint instead.",
            default="",
        )
        templateId: str = Field(
            description="Set to the ID of your HTML template. You can find and copy the ID from HTML to PDF Templates.",
            default="",
        )
        templateData: str = Field(
            description="Set it to a string with input JSON data (recommended) or CSV data.",
            default="",
        )
        margins: str = Field(
            description="Set to CSS style margins like 10px, 5mm, 5in for all sides or 5px 5px 5px 5px (the order of margins is top, right, bottom, left). (Optional)",
            default="",
        )
        paperSize: str = Field(
            description="A4 is set by default. Can be Letter, Legal, Tabloid, Ledger, A0, A1, A2, A3, A4, A5, A6 or a custom size. Custom size can be set in px (pixels), mm or in (inches) with width and height separated by space like this: 200 300, 200px 300px, 200mm 300mm, 20cm 30cm or 6in 8in. (Optional)",
            default="",
        )
        orientation: str = Field(
            description="Set to Portrait or Landscape. Portrait is set by default. (Optional)",
            default="",
        )
        printBackground: bool = Field(
            description="true by default. Set to false to disable printing of background. (Optional)",
            default=True,
        )
        mediaType: str = Field(
            description="Uses print by default. Set to screen to convert HTML as it appears in a browser or print to convert as it appears for printing or none to set none as mediaType for CSS styles. (Optional)",
            default="",
        )
        DoNotWaitFullLoad: bool = Field(
            description="false by default. Set to true to skip waiting for full load (like full video load etc. that may affect the total conversion time). (Optional)",
            default=False,
        )
        header: str = Field(
            description="User definable HTML for the header to be applied on every page header. (Optional)",
            default="",
        )
        footer: str = Field(
            description="User definable HTML for the footer to be applied on every page footer. (Optional)",
            default="",
        )
    
        worksheetIndex: str = Field(
            description="Index of the worksheet to convert. (Optional)", default=""
        )
    
        def parse_payload(self, async_mode: bool = True):
            payload = {
                "async": async_mode,
            }
            if self.url:
                payload["url"] = self.url
            if self.httpusername:
                payload["httpusername"] = self.httpusername
            if self.httppassword:
                payload["httppassword"] = self.httppassword
            if self.pages:
                payload["pages"] = self.pages
            if self.unwrap:
                payload["unwrap"] = self.unwrap
            if self.rect:
                payload["rect"] = self.rect
            if self.lang:
                payload["lang"] = self.lang
            if self.line_grouping:
                payload["lineGrouping"] = self.line_grouping
            if self.password:
                payload["password"] = self.password
            if self.name:
                payload["name"] = self.name
            if self.autosize:
                payload["autosize"] = self.autosize
    
            if self.html:
                payload["html"] = self.html
            if self.templateId:
                payload["templateId"] = self.templateId
            if self.templateData:
                payload["templateData"] = self.templateData
            if self.margins:
                payload["margins"] = self.margins
            if self.paperSize:
                payload["paperSize"] = self.paperSize
            if self.orientation:
                payload["orientation"] = self.orientation
            if self.printBackground:
                payload["printBackground"] = self.printBackground
            if self.mediaType:
                payload["mediaType"] = self.mediaType
            if self.DoNotWaitFullLoad:
                payload["DoNotWaitFullLoad"] = self.DoNotWaitFullLoad
            if self.header:
                payload["header"] = self.header
            if self.footer:
                payload["footer"] = self.footer
    
            if self.worksheetIndex:
                payload["worksheetIndex"] = self.worksheetIndex
    
            return payload
  • The __init__.py imports the modification module (which contains pdf_merge) and registers it with the MCP server via the import chain.
    import sys
    from pdfco.mcp.server import mcp
    from pdfco.mcp.tools.apis import (
        conversion,
        job,
        file,
        modification,
        form,
        search,
        searchable,
        security,
        document,
        extraction,
        editing,
    )
Behavior3/5

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

No annotations exist; the description adds some behavioral context (supports various file types and ZIP archives) but does not disclose important traits like merge order, file size limits, or authentication requirements beyond the schema. The reference URL may provide more detail, but the description itself is sparse.

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 extremely concise with two short sentences: one stating purpose and one linking to documentation. It is front-loaded and efficient, with no unnecessary text.

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?

No output schema is provided, and the description does not explain what the tool returns (e.g., a URL or file reference). It also does not mention whether the merge is synchronous or requires job checking (sibling tools exist for that). The description is incomplete for a merging tool with no output schema.

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 schema descriptions are detailed (especially for 'url'). The tool description does not add new parameter insights beyond what the schema provides, so it meets the baseline of 3.

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 tool merges multiple files (PDF, DOC, XLS, images, ZIP) into a new PDF, using a specific verb 'merge' and resource 'PDF', and distinguishes from sibling conversion tools like csv_to_pdf, image_to_pdf, pdf_split, etc.

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 implies usage for combining multiple files into a single PDF but does not explicitly state when to use this tool versus alternatives (e.g., when to use pdf_merge vs document_to_pdf or image_to_pdf). No exclusions or preferred scenarios are 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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