banteg
132 lines
3.4 KiB
Markdown
132 lines
3.4 KiB
Markdown
Below is a concrete implementation spec for the **Pi (pi-coding-agent CLI)** runner shipped in Takopi (v0.5.0).
|
|
|
|
---
|
|
|
|
## Scope
|
|
|
|
### Goal
|
|
|
|
Provide the **`pi`** engine backend so Takopi can:
|
|
|
|
* Run Pi non-interactively via the **pi CLI** (`pi --print`).
|
|
* Stream progress by parsing **`--mode json`** (newline-delimited JSON). Each line is a JSON object.
|
|
* Support resumable sessions via **`--session <path>`** (Takopi emits a canonical resume line the user can reply with).
|
|
|
|
### Non-goals (v1)
|
|
|
|
* Interactive TUI flows (session picker, prompts, etc.)
|
|
* RPC mode (requires a long-running process and JSON commands)
|
|
|
|
---
|
|
|
|
## UX and behavior
|
|
|
|
### Engine selection
|
|
|
|
* Default: `takopi` (auto-router uses `default_engine` from config)
|
|
* Override: `takopi pi`
|
|
|
|
### Resume UX (canonical line)
|
|
|
|
Takopi appends a **single backticked** resume line at the end of the message, like:
|
|
|
|
```text
|
|
`pi --session /home/user/.pi/agent/sessions/--repo--/2026-01-02T12-34-56-789Z_abcd.jsonl`
|
|
```
|
|
|
|
Notes:
|
|
|
|
* `pi --resume/-r` opens an interactive session picker, so Takopi uses `--session <path>` instead.
|
|
* The resume token is the **session file path** (JSONL), treated as an opaque string.
|
|
* If the path contains spaces, the runner will quote it.
|
|
|
|
### Non-interactive runs
|
|
|
|
Use `--print` and `--mode json` for headless JSONL output.
|
|
|
|
Pi does not accept `-- <prompt>` to protect prompts starting with `-`. Takopi prefixes a leading space if the prompt begins with `-` so it is not parsed as a flag.
|
|
|
|
---
|
|
|
|
## Config additions
|
|
|
|
Takopi config lives at `~/.takopi/takopi.toml`.
|
|
|
|
Add a new optional `[pi]` section.
|
|
|
|
Recommended schema:
|
|
|
|
```toml
|
|
# ~/.takopi/takopi.toml
|
|
|
|
default_engine = "pi"
|
|
|
|
[pi]
|
|
model = "..." # optional; passed as --model
|
|
provider = "..." # optional; passed as --provider
|
|
extra_args = [] # optional list of strings, appended verbatim
|
|
```
|
|
|
|
Notes:
|
|
|
|
* `extra_args` lets you pass new Pi flags without changing Takopi.
|
|
* Session files are stored under Pi's default session dir:
|
|
`~/.pi/agent/sessions/--<cwd>--` (with path separators replaced by `-`).
|
|
|
|
---
|
|
|
|
## Code changes (by file)
|
|
|
|
### 1) New file: `src/takopi/runners/pi.py`
|
|
|
|
Expose a module-level `BACKEND = EngineBackend(...)`.
|
|
|
|
#### Runner invocation
|
|
|
|
The runner should launch Pi in headless JSON mode:
|
|
|
|
```text
|
|
pi --print --mode json --session <session.jsonl> <prompt>
|
|
```
|
|
|
|
When resuming, `<session.jsonl>` is the resume token extracted from the chat.
|
|
|
|
#### Event translation
|
|
|
|
Pi JSONL output is `AgentSessionEvent` (from `@mariozechner/pi-agent-core`).
|
|
The runner should translate:
|
|
|
|
* `tool_execution_start` -> `action` (phase: started)
|
|
* `tool_execution_end` -> `action` (phase: completed)
|
|
* `agent_end` -> `completed`
|
|
|
|
For the final answer, use the most recent assistant message text (from
|
|
`message_end` events). For errors, if the assistant stopReason is `error` or
|
|
`aborted`, emit `completed(ok=false, error=...)`.
|
|
|
|
---
|
|
|
|
## Installation and auth
|
|
|
|
Install the CLI globally:
|
|
|
|
```text
|
|
npm install -g @mariozechner/pi-coding-agent
|
|
```
|
|
|
|
Auth is stored under `~/.pi/agent/auth.json`. Run `pi` once interactively to
|
|
set up credentials before using Takopi.
|
|
|
|
---
|
|
|
|
## Known pitfalls
|
|
|
|
* `--resume` is interactive; Takopi uses `--session <path>` instead.
|
|
* Prompts that start with `-` are interpreted as flags by the CLI. Takopi
|
|
prefixes a space to make them safe.
|
|
|
|
---
|
|
|
|
If you want, I can also add a sample `takopi.toml` snippet to the README or
|
|
include a small quickstart section for Pi in the onboarding panel.
|