rpi-cli

The terminal coding-agent CLI — the rpi binary — built on the rpi-* library crates. It is the ready-to-run surface of the rpi project: an interactive TUI, a one-shot -p mode, a JSON event mode, durable sessions, and Rust cdylib plugin loading.

Install

cargo install rpi-cli

Requires Rust 1.88 or newer. Then point it at a provider and start it:

export ANTHROPIC_API_KEY=...     # or OPENAI_API_KEY, or ~/.rpi/agent/models.json
rpi

One-shot, and machine-readable output:

rpi -p "summarize the README"
rpi --mode json -p "list the crates"

Authentication

Credentials are resolved in priority order:

1. --api-key on the command line
2. ~/.rpi/auth.json, written by rpi auth login (mode 0o600 on Unix)
3. the apiKey field of a provider in ~/.rpi/agent/models.json
4. provider environment variables: OPENAI_API_KEY, ANTHROPIC_AUTH_TOKEN, ANTHROPIC_API_KEY

~/.rpi/ can be relocated with RPI_CODING_AGENT_DIR.

Custom providers and gateways

Any Anthropic-Messages or OpenAI-compatible endpoint can be declared in ~/.rpi/agent/models.json:

{
  "providers": {
    "gateway": {
      "api": "anthropic-messages",
      "baseUrl": "https://gateway.example.com",
      "apiKey": "sk-gateway-secret",
      "authHeader": true,
      "headers": { "x-portkey-key": "…" },
      "models": [{ "id": "custom-claude", "name": "Custom Claude" }]
    }
  }
}

rpi --model gateway/custom-claude -p "hi"

Use "api": "openai-completions" for an OpenAI-compatible endpoint. Anthropic endpoint overrides also honour ANTHROPIC_BASE_URL and ANTHROPIC_AUTH_TOKEN.

Sessions and resources

• Sessions are JSONL v4 files under the session directory, with branching and context compaction.
• Project resources are discovered from .rpi/ (skills, prompts, themes, and SYSTEM.md), with ~/.rpi/agent/ as the global layer. When both define the same skill or prompt name, the project copy wins.
• Plugins are loaded from project .rpi/extensions, global ~/.rpi/agent/extensions, and --extensions-dir.

Plugins

rpi install rpi-todo                           # prebuilt: repository discovered via crates.io
rpi install rpi-todo --version 0.2.0
rpi install my-extension --github owner/repo --version 1.2.3
rpi install rpi-todo --build                    # explicitly compile source
rpi install my-extension --path ../my-extension --force   # local
rpi dev                                        # build + watch a local extension

rpi install defaults to the versioned rpi-extension.json prebuilt protocol: it resolves a non-yanked stable package version and repository through crates.io, loads the <package>-v<version> Release manifest, and verifies the archive and declared library before transactionally installing it into ~/.rpi/agent/extensions. Explicit --github owner/repo installs use package-specific tags and also support unpublished extensions. Both repository forms consume the same protocol; they never infer library filenames or use repository-wide latest bundles. Missing prebuilt releases fail with an actionable error; --build and --path explicitly select Cargo compilation. Installed provenance preserves the source for update discovery, reinstalls and uninstall. Actual plugin ABI/API-size validation still happens when loading the library.

rpi install <name> installs or upgrades an extension without --force. An already installed version is skipped; use --force to reinstall the same version or allow a downgrade. These rules also apply to explicit Cargo builds and local installs.

rpi extension update updates all project-linked extensions and globally installed registry/prebuilt extensions; rpi extension update <name> selects one extension by name. Updates retain the original Cargo build backend or explicit GitHub source. Global development installs made with --path are excluded. The old rpi package update [name] remains compatible, but rpi extension update [name] is recommended for extension updates. Project linking commands remain rpi package link, rpi package list, and rpi package unlink.

Remote mode

rpi --server                      # headless agent over TCP, prints a token
rpi --connect host:port --token T # zero-local-resource TUI client

The client holds no local provider, tools, extensions or session files; all agent work happens on the server. See docs/remote/user-guide.md.

Default tools

The CLI loads the Pi-compatible read, write, edit and bash tools. Additional implementations (grep, find, ls, docs, powershell) remain available in the rpi-tools library and through the default_tools setting.

Library usage

The crate also exposes its internals, so the CLI surface can be embedded:

[dependencies]
rpi-cli = "0.3"

For building your own agent, depend on rpi-agent and rpi-harness directly instead — see docs/agent/project-structure.md.

RPC message identity, images and client text files

rpi --mode rpc exposes additive, explicitly negotiated native contracts for optional durable message identity, ordered inline PNG/JPEG prompt input, and client-authoritative text I/O through the existing built-in read/write/edit tools. Legacy text/local operation remains the default; client terminal support and an OS filesystem sandbox are not implied. See the native protocol contract for gates, wire shapes, limits, authority combinations and validation scope. Consumers must check ready capabilities rather than infer support from a crate version.

Custom-entry branch queries (RPC and runtime actions)

get_session_branch is a filtered custom-entry query, not an unfiltered transcript export. RPC example:

{"id":"preview-1","type":"get_session_branch","customTypes":["durable-state","other-custom-type"],"afterSeq":42,"limit":20,"order":"newestFirst"}

customTypes is required and must be a non-empty array of non-blank strings. Type identifiers match exactly as written by append_entry: whitespace and case are preserved, and only exact duplicate identifiers are deduplicated. Only afterSeq (non-negative integer), limit (positive integer), and order (oldestFirst, the default, or newestFirst) are optional query arguments. The cursor is exclusive in the selected order: seq > afterSeq for oldestFirst, seq < afterSeq for newestFirst. Type filtering and branch ancestry apply before global ordering and limit across all requested types. Results are {"entries":[...],"count":N,"filtered":true}.

Runtime action GetSessionBranch accepts the same query, without RPC's type and id envelope. Both surfaces reject {}, unknown fields, and the retired query keys customType, custom_type, custom_types, and after_seq, even when mixed with valid modern keys. This canonical contract has no alias fallback. append_entry / AppendEntry still use singular customType for writes.

Migration from unfiltered hosts

This is a breaking query-contract change: replace unfiltered {} or legacy arguments with an explicit customTypes list. Upgrade the host and consumers together. Older hosts may accept the new arguments but ignore them; clients requiring filtering must require filtered == true in the reply and reject unsupported hosts rather than treating an unfiltered branch as filtered data. Plugin ABI compatibility alone does not establish this query capability. get_messages, get_history, and the append/write protocol are unchanged.

Documentation

• User guide: https://rpi.bigfisharc.cn/docs.html
• Architecture: docs/architecture/overview.md
• Extension authoring: docs/extensions/authoring.md
• Changelog: CHANGELOG.md

License

MIT. See LICENSE and NOTICE.

This crate is part of a Rust port of the MIT-licensed TypeScript pi SDK (© Mario Zechner).

CLI self-update

rpi update downloads the matching GitHub prebuilt CLI using the versioned rpi-release.json distribution protocol. It verifies target, archive size, both SHA-256 hashes, and the executable version before using the existing atomic replacement and Windows staging helper. Version discovery uses crates.io. Only rpi update --build selects local Cargo compilation; missing manifests and failed checks preserve the installed executable. --force reinstalls and --offline reports cached information without downloads or builds.