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152 stars · Rust

How to use Pi Rust: what you can do with it

What is Pi Rust? rpi is a Rust-native coding-agent runtime with a terminal CLI, built as nine composable crates for LLM providers, tools, sessions, and a plugin ABI.

How do I use it? Run cargo install rpi-cli; then run rpi --version to confirm the install; run export ANTHROPIC_API_KEY=... or export OPENAI_API_KEY=... with your own key. Full steps below.

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What do you want to do?

4 use cases

  • Run a one-shot coding task from the terminal

    Install the rpi CLI and send it a single task from the shell with a model API key.

    View prompt
    Install rpi-cli from the bigfish1913/pi-rust repository using cargo, then run `rpi -p "<task>"` in <project-directory> with the API key set. Expected output: a text answer to the task. Verify that `rpi --version` prints a version before running the task.

  • Feed agent events into a script as JSON

    Use the JSON output mode to get a machine-readable event stream from a one-shot run.

    View prompt
    Using the bigfish1913/pi-rust CLI, run `rpi --mode json -p "<prompt>"` in <repo-path> and save the output to <output-file>. Expected output: a machine-readable event stream. Verify that the file is non-empty and that each line parses as JSON before using it downstream.

  • Test an embedded agent offline with no API key

    Run the minimal example against the deterministic faux provider to test agent behavior.

    View prompt
    Clone bigfish1913/pi-rust, run `cargo run -p minimal`, and then write a Rust test in <target-crate> that builds an agent with the faux provider and asserts the reply. Expected output: the minimal example prints 2 messages after run and the assistant reply. Verify that the test passes with no network access and no API key set.

  • Build a plugin tool that loads into every rpi session

    Write a cdylib plugin with rpi-plugin-sdk so the global rpi binary loads your tool.

    View prompt
    In the bigfish1913/pi-rust repository, copy examples/plugin-stub into <new-plugin-folder>, implement one tool in it, and build it as a cdylib. Expected output: a compiled shared library that rpi can load. Verify that `rpi --version` still runs after the plugin is placed in the loader path.

Quick start with Pi Rust

  1. Check you have what it needs: Rust 1.78 or later, for installing from crates.io; An ANTHROPIC_API_KEY or OPENAI_API_KEY, or a ~/.rpi/agent/models.json file, for live model calls; Git, to clone the repository for the offline examples.
  2. Open bigfish1913/pi-rust on GitHub and read the README and license.
  3. Run cargo install rpi-cli
  4. Run rpi --version to confirm the install
  5. Run export ANTHROPIC_API_KEY=... or export OPENAI_API_KEY=... with your own key (inferred, check the README)
  6. Run rpi -p "summarize the README" from the project directory

These steps come from our top use case, Run a one-shot coding task from the terminal, which also has a copy-paste agent prompt.

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About this repo

  • Who it is forRust developers and engineers who want a coding agent they can run from the terminal, embed in their own process, or extend with plugins.
  • Why it is hot152 stars, launched 72 days ago
  • LanguageRust
  • Sourcegithub.com/bigfish1913/pi-rust · Back to Hot repos

Requirements

  • Rust 1.78 or later, for installing from crates.io
  • An ANTHROPIC_API_KEY or OPENAI_API_KEY, or a ~/.rpi/agent/models.json file, for live model calls
  • Git, to clone the repository for the offline examples

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Questions about Pi Rust

What is Pi Rust?

rpi is a Rust-native coding-agent runtime with a terminal CLI, built as nine composable crates for LLM providers, tools, sessions, and a plugin ABI. It is an open-source project on GitHub: https://github.com/bigfish1913/pi-rust.

How do I use Pi Rust?

Run cargo install rpi-cli; then run rpi --version to confirm the install; run export ANTHROPIC_API_KEY=... or export OPENAI_API_KEY=... with your own key. The use cases on this page give the full steps and a copy-paste agent prompt for each job.

Who is Pi Rust for?

Rust developers and engineers who want a coding agent they can run from the terminal, embed in their own process, or extend with plugins.

What can I do with Pi Rust?

4 use cases so far, for example: Run a one-shot coding task from the terminal; Feed agent events into a script as JSON; Test an embedded agent offline with no API key. Each has steps and a copy-paste agent prompt.

What do I need to run Pi Rust?

Rust 1.78 or later, for installing from crates.io; An ANTHROPIC_API_KEY or OPENAI_API_KEY, or a ~/.rpi/agent/models.json file, for live model calls; Git, to clone the repository for the offline examples.

What are alternatives to Pi Rust?

Other hot AI repos in Software and DevOps: Deep Infer, Harness2, Orca, Opencode, Graphify.

Is Pi Rust safe to run?

Deduped does not own, audit or vouch for it. Read the README and license, run it on your own systems first and review every command before you run it.