agentledger-runtime 1.3.0

# AgentLedger Rust Runtime

This directory contains the dependency-free Rust runtime-core package for AgentLedger 1.3.0.

It runs a native local runtime loop and participates in the shared Python/Go/TypeScript/Rust conformance gate.

## Current Status

Implemented:

- in-memory runtime store and local snapshot save/load
- run/session/step state model
- leased step claim, lease recovery, and cancellation fencing
- `AgentContext` with state patch writes
- runtime-managed tool calls through `Runtime::call_tool`
- Tool Ledger idempotency for side-effect tools
- evidence export, replay, trace/diff/debug consumers, time-travel timeline, repro helpers
- policy denial, approval pause/resume, sandbox fail-closed behavior
- cost records, budget enforcement, and failure attribution
- media artifact refs and stream checkpoint refs in evidence/replay
- scheduler facade, worker service semantics, failure injection, adversarial review, evidence regression
- MCP-style and dependency-free framework adapters
- official optional adapter APIs for Postgres, S3/MinIO, OTLP transport, Docker sandbox manifests, and command-style Docker execution
- CLI for `conformance`, `contract validate`, and `contract export`

Not claimed yet:

- live Postgres/S3/Docker/OTLP service-backed hardening
- async runtime integration
- production sandbox executors
- full media processing and stream transport adapters


## Install

Use the published crates.io package in a Rust project:

```bash
cargo add agentledger-runtime
```

Import the library crate as `agentledger`:

```rust
use agentledger::{simple_run, AgentContext, Result, State, Value};
```

From this repository, use Cargo directly while developing:

```bash
cd rust
cargo run --quiet -- quickstart
cargo run --quiet --example quickstart
```

## Quickstart

```rust
use agentledger::{simple_run, AgentContext, Result, State, Value};

fn agent(ctx: &mut AgentContext, input: State) -> Result<Option<Value>> {
    if let Some(name) = input.get("name") {
        ctx.write_state("message", Value::String(format!("hello {:?}", name)));
    }
    Ok(Some(Value::String("done".to_string())))
}

fn main() -> Result<()> {
    let mut input = State::new();
    input.insert("name".to_string(), "world".into());
    let result = simple_run(agent, input)?;
    println!("{}", result.run_id);
    Ok(())
}
```

## Adapter Quickstart

```rust
use agentledger::{PostgresAdapter, S3BlobStoreAdapter};

let mut pg = PostgresAdapter::new(injected_sql_client, "agentledger");
pg.apply_migrations()?;

let mut s3 = S3BlobStoreAdapter::new(injected_object_client, "agentledger-test", "agentledger/blobs");
let (_digest, reference) = s3.put_json(&value)?;
println!("{}", reference);
```

## Verify

```bash
cd rust
cargo test --lib --bins
cargo run --quiet -- conformance
cargo run --quiet -- contract validate
```

From the repository root:

```bash
python3.11 scripts/check_language_parity.py --json-report /tmp/agentledger-language-parity.json
```

## Compatibility Target

```text
../contracts/agentledger.runtime.v1.json
../contracts/conformance/runtime_semantics.v1.json
../docs/LANGUAGE_QUICKSTART.md
../docs/LANGUAGE_PARITY_MATRIX.md
```