eCore guides

Use it today

eCore has no release tag yet. Two ways in:

• Through eMCP. emcp re-exports it as emcp::ecore and emcp::{SessionId, Token, Failure, ErrorCode, DeliveryVerdict}; depend on emcp at its tag (eMCP guides).
• From a checkout. A path or git dependency on apps/desktop/crates/ecore at a pinned rev, until the first tag; then the rules of Install from a release tag apply.

use emcp::ecore::{SessionId, Token};

let run = SessionId::new("run-1")?;          // the one id rule
let token = Token::from_header(header);      // Option<Token>: 64 lowercase hex
let value = token.map(|t| t.header());       // back to "Bearer …"

Change a type

The contract is the one source. Edit packages/ecore/contract.json, then regenerate all four languages:

bun run --filter @exp/ecore generate

packages/ecore/fixtures/ecore.json replays on Rust, TypeScript, Swift and Kotlin, and a drift test fails a stale output.

The contract and the crate in full: Reference.