mcp-base64

by Wuodan

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Python

Local

Encode File To Base64

encode_file_to_base64

Reads a file in binary mode and returns its contents as a base64 string. Requires an absolute path for security.

Instructions

Encode a file to a base64 string.

This tool reads a file in binary mode and returns its contents encoded as a base64 string. Only absolute paths are allowed for security reasons.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`file_path`	Yes	Absolute path to the file to encode to base64

Output Schema

TableJSON Schema

Name	Required	Description	Default
`result`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

First observedv0.1.0Jul 7, 2026

TDQS

A4.1/5.0

Behavior4/5

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

No annotations exist, so the description carries the transparency burden. It discloses that the file is read in binary mode, that contents are returned as base64, and that relative paths are disallowed for security. It does not mention missing-file or permission errors, but the read-only nature is clear.

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?

Two sentences, front-loaded with the action, followed by a relevant behavioral and security constraint. No filler or repetition of schema details.

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?

With one well-documented parameter, a strict path rule, and an output schema available, the definition gives an agent everything needed to invoke the tool correctly. The sibling decode tool is visible in context, so the encode/decode relationship is clear even without in-text mention.

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 single parameter is already fully described in the schema with examples at 100% coverage. The description mostly reinforces the absolute-path expectation and adds the security rationale, which is useful but not a substantial semantic addition.

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?

States a specific verb ('Encode'), a resource ('a file'), and the output format ('base64 string'). It further specifies binary mode and the absolute-path restriction, which separates it from the decode sibling. The purpose is unambiguous and distinct from decode_base64_to_file.

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?

No explicit when-to-use or alternative routing is given; the decode sibling is never mentioned. The correct use is only implied by the encode/decode naming and the action description, and the only stated constraint is absolute paths.

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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