Sippion MCP server

Sippion

English | 日本語

Use less AI context. Make API tokens — and subscription usage allowances — last longer.

Sippion is a local, read-only MCP server that helps AI coding agents consume fewer tokens. Instead of letting an agent open large parts of a repository, Sippion's single tool, repo_context, returns a small set of relevant, bounded source excerpts first.

This reduces unnecessary context per task. It can lower usage for API-based workflows, but that is not the only benefit: Sippion can also help subscription-based AI coding plans last longer by reducing how much context the agent needs to consume.

How it works

AI coding agent
    ↓ ask for focused repository context
Sippion repo_context
    ↓ return a few relevant excerpts
AI reads only the files it actually needs

Example:

repo_context {"q":"authentication token validation"}

Sippion uses bounded lexical, structural, and semantic retrieval while staying local and read-only.

Install

macOS / Linux

curl -fsSL --proto '=https' --proto-redir '=https' --tlsv1.2 https://raw.githubusercontent.com/Sitten-Tokyo/Sippion/75d6b27e83b86bec00297cd5b5c05bb014e16904/scripts/bootstrap.sh | sh

Windows PowerShell

irm https://raw.githubusercontent.com/Sitten-Tokyo/Sippion/75d6b27e83b86bec00297cd5b5c05bb014e16904/scripts/bootstrap.ps1 | iex

Then restart your AI client. sippion setup registers Sippion for Codex, Claude Code, Antigravity, and OpenCode.

Useful commands:

sippion setup
sippion doctor
sippion uninstall
sippion mcp --root-auto

Why Sippion

• Fewer tokens: gives the agent focused repository context instead of broad file reads.
• Useful beyond API billing: can help subscription usage allowances last longer too.
• Local and private: no network access while serving repository context.
• Read-only: never modifies the repository or executes repository code.
• No persistent index: retrieval state stays in RAM.
• Small surface area: one MCP tool, repo_context.

Sippion is a repository-context tool, not a compiler or language server. Structural parsing currently covers Rust, Python, JavaScript/TypeScript, Go, Java, C#, C, and C++.

Safety

Sippion does not run repository code, build scripts, compilers, LSP servers, or shell commands during retrieval. Repository text is treated as untrusted data, and high-confidence secrets are redacted before model output.

See Security and trust boundary for details.

Documentation

• Client setup
• Architecture
• Security and trust boundary
• Efficiency layer
• Quality and validation
• Contributing

Credits

The compact efficiency behavior is inspired by Ponytail and i-have-adhd. License notes are in Third-party notices.