Thomas Piacentini
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Streaming Agent Shell in Rust

Original text · English480 min

An inspectable repository-observation process usable by different coding agents.

The Rust process accepts a deliberately small tool language. Its Python adapter accepts JSONL with caller ids and tool arguments, then translates only known commands. No argument becomes an operating-system shell command.

Start with a learner workspace

Data management, Tool schema design. Language foundation: Rust ownership and Result.

Install Rust (rustc) and Python 3.10+. The core uses the Rust standard library; Python adapters compile into private temporary directories.

bash
python3 scripts/project_test.py rust-agent-shell --init learning-artifacts/rust-agent-shell
python3 scripts/project_test.py rust-agent-shell --stage 1 --path learning-artifacts/rust-agent-shell

Build route

  1. Parse a deliberately small action language
  2. Confine file tools to a bounded root
  3. Track budgets and terminal state
  4. Stream bounded JSON events through real stdin

Run with your own inputs

After completing the stages, these commands run your workspace code on the original Orchard examples. Replace the sample paths with your own files.

bash
python3 learning-artifacts/rust-agent-shell/client.py projects/rust-agent-shell/examples/workspace projects/rust-agent-shell/examples/requests.jsonl --limit 8 --out observations.jsonl

To inspect the complete reference first, replace learning-artifacts/rust-agent-shell with projects/rust-agent-shell/solution in the same command. JSON results use schema_version: 1; paths and argument examples are explicit so another tool can consume them.

Integration boundary

JSONL requests use caller ids and explicit tool argument objects. The adapter translates them to the bounded Rust stdin grammar. --limit controls actions; native file reads remain capped at 16 KiB. Application path checks do not provide OS isolation or close adversarial replacement races.

bash
python3 scripts/project_test.py rust-agent-shell --all --solution --strict
python3 scripts/project_test.py rust-agent-shell --all --path learning-artifacts/rust-agent-shell --strict

The first command checks the reference. The second checks your implementation. The published examples and tests are regression evidence, not a production certification or an unseen benchmark.

Primary references

Code and artifacts 29
What you take away

Saved in your notebook on this device.

Sources and limits

Reading checkpoints are self-reported. Test results are recorded separately and apply to the executed cases.

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