token-terminator (Rust interoperability crate)

v0.11.0 — Rust interoperability helpers for Token Terminator, the evidence-preserving token-reduction layer for agent runtimes.

Scope: this crate is intentionally small. The Python package supplies the ContextEngine, SQLite vault, Context IR, learned omission-risk policy, dashboard and Hermes integration. This companion lets Rust hosts produce and verify stable artifact identities and enforce the baseline strict-reduction rule.

Install

cargo add token-terminator@0.11.0

The library name is token_terminator:

use token_terminator::{artifact_identity, strictly_smaller_chars, verify_sha256};

let identity = artifact_identity("exact tool evidence");
assert!(identity.artifact_id.starts_with("a_"));
assert!(verify_sha256("exact tool evidence", &identity.sha256));
assert!(strictly_smaller_chars("long provider-visible evidence", "short receipt"));

Compatibility contract

The artifact contract introduced in Token Terminator 0.5.x remains unchanged:

• SHA-256 is computed over exact UTF-8 bytes.
• Normal artifact IDs use a_ plus the first 32 lowercase digest characters.
• The full digest is supported as the short-ID collision fallback.
• strictly_smaller_chars requires a character decrease. It does not count tokens.

Python's ContextEngine and Context IR additionally require an actual-tokenizer reduction of the complete request. Rust hosts must supply equivalent measurement and recovery boundaries themselves; this helper is not a substitute for them.

What this crate does not do

It does not implement the Python runtime, Hermes hooks, SQLite storage, JEV selection, learned-policy training, Context IR, dashboard, tokenizer selection, RTK rewriting or PyO3 acceleration. The Python package does not depend on Rust. A native accelerator remains a profiling-driven future option.

Version 0.11.0 aligns the companion package and guides with the product release; it does not claim new identity semantics or a Rust port of the Python features.

Full integration notes · Rust API docs · crates.io

MIT licensed.