Mcp Sophon

Sophon

**Deterministic context compression for MCP agents.** One Rust binary. Zero ML at query time. Reproducible benchmarks, real-data measurements.

[](https://www.npmjs.com/package/mcp-sophon) [](https://www.npmjs.com/package/mcp-sophon) [](https://github.com/lacausecrypto/mcp-sophon/releases) [](https://github.com/lacausecrypto/mcp-sophon/actions/workflows/ci.yml) [](./LICENSE) [](https://www.rust-lang.org) [](https://modelcontextprotocol.io) [](./BENCHMARK.md)

Sophon is a deterministic context layer for agents speaking the Model Context Protocol. It compresses prompts, conversation memory, code digests, file deltas, and shell output — without an embedding model at query time, without a GPU, and without API keys.

**Single 5.2 MB Rust binary.** MCP-native. `cl100k_base`-accurate. Default build pulls no Python, no ML weights, no network.

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What it does, in 30 seconds

Tool	What it solves
compress_prompt	Long structured prompt → keep only sections relevant to the query
compress_history	Growing conversation → summary + facts + recent window + optional retrieval
compress_output	Shell stdout/stderr → 21 domain-aware filters (git, cargo, docker, kubectl, JSON, …)
read_file_delta / write_file_delta	Re-reads + edits → diffs only, never the whole file
encode_fragments	Repeated boilerplate → single token refe