code-mode

Add a "code mode" tool to an existing MCP server so LLMs can write small processing scripts that run against large API responses in a sandboxed runtime — only the script's compact output enters the LLM context window. Use this skill whenever someone wants to add code mode, context reduction, script execution, sandbox execution, or LLM-generated-code processing to an MCP server. Also trigger when users mention reducing token usage, shrinking API responses, running user-provided code safely, or adding a code execution tool to their MCP server — in any language (TypeScript, Python, Go, Rust, etc.).

2.20x

Quality

85%

Does it follow best practices?

Impact

95%

2.20x

Average score across 3 eval scenarios

Securityby

Advisory

Suggest reviewing before use

Evaluation results

94%

58%

Add Code Execution to a Kubernetes MCP Server

TypeScript sandbox executor

Criteria

Without context

With context

quickjs-emscripten selected

100%

DATA injected as string

100%

DATA variable name

100%

stdout capture via console.log

50%

100%

Handle disposal

100%

Timeout enforced

100%

Error messages returned

100%

Size measurement line

100%

Tool parameter: code

100%

Tool parameter: language optional

Executor is single file

100%

Tool is single file

100%

72%

Add Script Execution to a Python SCIM MCP Server

Python sandbox executor

Criteria

Without context

With context

Python-appropriate sandbox

100%

compile_restricted used

100%

safe_globals base

100%

DATA injected as string

100%

DATA variable name

100%

print() allowed

100%

Timeout enforced

100%

Error messages returned

100%

Size measurement line

100%

Tool parameter: code

100%

Executor is single file

100%

Tool is single file

100%

92%

26%

Benchmark Context Savings for a Go GitHub MCP Server

Benchmark context reduction

Criteria

Without context

With context

Before measurement: byte length

100%

After measurement: output byte length

100%

Reduction formula

100%

Table headers match spec

33%

Total row present

100%

Mock data used

100%

Multiple scenario patterns

100%

goja sandbox used

100%

DATA injected as string in Go

100%

benchmark_output.txt present

100%

Repository: chenhunghan/code-mode-skill
Commit: 3a2240a

Evaluated: about 1 month ago
Agent: Claude Code
Model: Claude Sonnet 4.6

Table of Contents

Add Code Execution to a Kubernetes MCP Server Add Script Execution to a Python SCIM MCP Server Benchmark Context Savings for a Go GitHub MCP Server

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