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MCP server tool calls limited by token count for large files

By PulseAugur Editorial · [1 sources] ·

A developer encountered a limitation when building an MCP server, discovering that large files cannot be passed directly as arguments to model tool calls. This is because tool arguments are part of the model's output, which is constrained by maximum output tokens, making it impossible to transmit large files. The solution involves modifying the tool to accept a file path instead of the file content, allowing the server to read the file from disk and perform operations like uploading it. AI

IMPACT Developers using tool-calling models must pass file references, not raw file data, to avoid token limits and ensure functionality with large artifacts.

RANK_REASON This is a technical explanation of a limitation and a solution for a specific tool-calling mechanism, not a new product release or significant industry event.

Read on dev.to — MCP tag →

AI-generated summary · Google Gemini · from 1 sources. How we write summaries →

MCP server tool calls limited by token count for large files

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Tool
This is a technical explanation of a limitation and a solution for a specific tool-calling mechanism, not a new product release or significant industry event.
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Only one publisher covered this so far. Single-source stories can still rank when the publisher is high-authority, but they lack cross-source corroboration.
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High
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106 days old
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COVERAGE [1]

  1. dev.to — MCP tag TIER_1 English(EN) · StelaSpace ·

    Your MCP server can't take a file as an argument — here's why, and the fix

    <p>I built an MCP server that publishes HTML files, and I hit a wall I haven't<br /> seen documented anywhere: <strong>you can't pass a large file as an MCP tool<br /> argument.</strong> Not "it's slow" or "it's awkward" — the model is physically<br /> incapable of doing it.</p> …

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