pi-claude-cli

Use your Claude Pro/Max subscription from the pi coding agent. The official Claude Code CLI handles authentication and model access. pi owns the prompt, tools, conversation and compaction.

pi install npm:@saccolabs/pi-claude-cli

Pick a model under pi-claude-cli with /model. The same default works in pi's terminal and Phosphor. No separate minimal mode or configuration is required.

Requires Node 22+, pi, and an authenticated claude binary on PATH (Claude Code 2.1.263+). Tested with pi 0.87.1 and Claude Code 2.1.280. Subscription credentials stay in the official CLI; no API key extraction.

One owner: pi

• Prompt: pi's current system prompt replaces Claude Code's coding-agent prompt. A short binding explains the MCP tool-name prefix. Project instructions, skills and .pi paths remain unchanged; Claude does not independently discover them.
• Tools: only the current request's tools are advertised. All tools, including read/edit/bash, execute in pi through the authenticated MCP bridge. Normal pi tool hooks, schemas and complete results apply. The provider never enables inactive tools. Claude-native agents, planning, scheduling and web tools are not enabled.
• Conversation: pi's current history is authoritative. A warm Claude process is reused only while the acknowledged history prefix and launch configuration match. Edits, compaction, provider changes, prompt changes or tool changes cause a clean reimport.
• Storage: default Claude processes use --no-session-persistence. No new Claude conversation file, resume pairing or saved system-prompt sidecar is created. Private temporary prompt and MCP files are removed when no longer needed; the runtime directory is removed on process exit. A SIGKILL can leave its private temporary directory behind.
• Compaction: pi compacts its own history normally. CLI auto-compaction is disabled. Hosts must not switch off pi compaction just because this provider is selected.

Switching providers

Claude → native pi → Claude uses the same pi session. Switching models retires the parked Claude process and clears its UI status. Switching back imports pi's current context, including native-provider turns, full tool results and images. Branch navigation and compaction cannot resume a stale Claude transcript.

A fresh CLI process costs a history import and may lose the previous prompt cache. Ordinary follow-ups and tool handoffs keep the warm process; pi does not resend history on each tool call.

Not byte-identical to a direct API provider: Claude Code's print interface accepts user messages, not an arbitrary structured conversation. Imports preserve message order and content using role-labelled text plus image blocks. Historical tool calls are records, not re-executed operations. Claude's internal runtime and service policies still apply.

For sessions created before 0.9.0, the next default call detaches the old resume pairing and imports pi's context automatically. Old Claude transcripts are retained as archives, never resumed by the default path. Missing information in old marker-only pi records cannot be recreated; new sessions record normal pi tool calls and results.

Host integration

See the context contract.

• Keep pi's project/skill discovery and auto-compaction enabled.
• Use pi's normal tool and transcript UI. Historical [Claude Code · ...] markers remain readable for old sessions.
• Explicit host hooks supplied with PI_CLAUDE_CLI_SETTINGS and managed Claude policy remain in force. Do not use --bare: it disables subscription authentication and hooks.
• The claude-rate-limit status reports subscription state outside conversation content.
• One-shot hosts should set PI_CLAUDE_CLI_KEEPALIVE_MS=0 so a parked process does not delay exit, and PI_CLAUDE_CLI_EPHEMERAL=1 so a run on the legacy path leaves nothing behind either.

Configuration

The defaults above require no environment variables.

PI_CLAUDE_CLI_CONTEXT=pi explicitly selects the default. legacy retains the old observer behavior for compatibility, with native Claude tools, a separate persistent transcript and CLI-owned compaction. PI_CLAUDE_CLI_SYSTEM_PROMPT, PI_CLAUDE_CLI_AUTOCOMPACT, PI_CLAUDE_CLI_TOOL_RESULTS, PI_CLAUDE_CLI_HERMETIC and PI_CLAUDE_CLI_STRICT_MCP configure that legacy path; they do not weaken pi ownership in the default path. Legacy architecture and wire contracts.

PI_CLAUDE_CLI_EPHEMERAL=1 is for one-shots such as pi -p --no-session (session naming, health checks). On the legacy path it spawns the CLI with --no-session-persistence and records no resume pairing or stored system prompt, as the default already does. Do not switch it on part-way through a persisted legacy session: the CLI would not record those turns, and a later resume would silently miss them.

Development

npm ci
npm run typecheck
npm run lint
npm run format:check
npm run test:coverage
npm run test:e2e

The test suite retains explicit legacy fixtures and adds default-policy tests for tool selection, prompt changes, branch/compaction resets, provider round-trips, images, errors and cleanup.

The opt-in real-CLI check spends subscription tokens in a disposable workspace:

PI_OWNED_LIVE=1 npx vitest run tests/live-context-policy.test.ts tests/live-pi-roundtrip.test.ts tests/live-thinking.test.ts

The isolated CLI check verifies read/custom-tool handoffs, host hooks, discovery isolation, warm follow-ups and absence of a saved Claude transcript. The real-pi RPC check executes read/edit, enforces a pi tool guard, switches through a deterministic native provider, then compacts pi and checks recall. The thinking check changes pi's thinking level between turns on Haiku 4.5 and Sonnet 5, and during a tool call, and reads each request's thinking and effort through a local proxy to confirm every turn ran at the chosen level on one CLI process. These checks do not measure coding-quality parity.

pi's thinking levels reach the model as the request pi's own Anthropic provider would send: off disables thinking, other levels send pi's budget (Haiku 4.5, Opus 4.5, Sonnet 4.5) or effort (adaptive models) with thinking summaries. A level changed mid-session applies from the next turn without restarting the CLI. Each model offers pi's own levels for it, less minimal on adaptive models (where it equals low). Details: docs/ARCHITECTURE.md.

License

MIT