---

summary: "Umbrella interaction-runtime package for pi with split subpackages." read_when:

• "Using @tryinget/pi-interaction in extensions." system4d: container: "Umbrella package docs for interaction-runtime split architecture." compass: "Stable facade API over editor-registry, interaction-kit, and trigger-adapter." engine: "Install umbrella -> register triggers/helpers -> keep import surfaces package-level." fog: "Avoid internal src imports across subpackages."

---

@tryinget/pi-interaction

Umbrella/facade package for live interaction runtime behavior in pi.

Canonical package home

This package lives in the pi-extensions monorepo at:

• packages/pi-interaction/pi-interaction

It is the canonical successor to the old standalone pi-input-triggers repo. The parent packages/pi-interaction/ directory is a package-group shell, not the publish target.

Package split (monorepo)

@tryinget/pi-interaction now composes three subpackages:

• @tryinget/pi-editor-registry — editor ownership + mount primitives
• @tryinget/pi-interaction-kit — selection/fuzzy/ranking UI primitives
• @tryinget/pi-trigger-adapter — trigger broker + registerPickerInteraction

The umbrella keeps the stable end-user extension entrypoint and re-exports the main helper API.

Install

{
  "packages": ["npm:@tryinget/pi-interaction"]
}

Extension author API (stable facade)

import {
  getBroker,
  registerPickerInteraction,
  splitQueryAndContext,
} from "@tryinget/pi-interaction";

Example trigger registration

registerPickerInteraction({
  id: "my-picker",
  description: "Template picker",
  match: /^\$\$\s*\/(.*)$/,
  loadCandidates: async () => ({
    candidates: [{ id: "nexus", label: "/nexus", detail: "High-leverage intervention" }],
  }),
  parseInput: (match) => {
    const parsed = splitQueryAndContext(String(match?.groups?.[0] ?? ""));
    return { query: parsed.query, context: parsed.context, raw: String(match?.groups?.[0] ?? "") };
  },
  applySelection: ({ selected, api }) => {
    api.setText(`$$ /${selected.id} `);
  },
});

Ownership boundary

@tryinget/pi-interaction owns the trigger/runtime substrate. It does not own product-specific trigger semantics such as PTX's $$ /... prompt-template accelerator surface. Those belong to the owning extension package (currently pi-prompt-template-accelerator), which should register through registerPickerInteraction.

Exact external editor bridge

Interactive Ghostty/Niri sessions expose a same-user, mode-0600 Unix socket under ${XDG_RUNTIME_DIR}/pi-editor-refine/. Each publisher receives a process-unique endpoint plus a mode-0600 <socket>.json discovery descriptor in the same mode-0700 directory. The descriptor carries only protocol/endpoint identity and TTL metadata: no editor text or content hashes. Clients must reject stale descriptors by checking the exact PID/start identity and socket before use.

Eligibility requires the exact owned TriggerEditor to be focused, one live process-bound session-presence publisher for the logical session, and the focused Niri window to match the presence-owned Ghostty process, app family, normalized surface, full gs:<family>:<surface> plus logical-session title suffix, and focus epoch.

The bridge owns editor access only; it does not call a model or define refinement prompts. A client must:

1. establish a short-lived snapshot of the exact expanded Pi editor buffer;
2. bind the full session, publisher, PID/start identity, owned editor instance/generation, Niri window/focus epoch, mode, transaction, deadline, and input digest;
3. return a changed candidate on the same connection (at most the snapshot and commit frames are accepted);
4. commit only while Pi is idle, no message is pending, the owned editor remains active, process/focus identity is unchanged, and both the exact editor preimage and monotonic generation still match;
5. query hash-only transaction status on a new connection after a lost reply rather than retrying an effect.

Outcomes remain in publisher memory for 30 seconds. found: false, expiry, or publisher restart means unknown and not retry-safe; it never authorizes another commit. A client must create a fresh operator action and transaction instead of replaying an uncertain effect.

Raw editor text is bounded and transported only in the snapshot/commit exchange. It is never logged, persisted, emitted as a session entry, included in diagnostics, or copied through the system clipboard. A successful changed native setEditorText() operation is one Pi undo unit (Ctrl+-); unchanged candidates are rejected rather than reported as applied. Unsupported terminals, ambiguous publishers, stale sockets, concurrent operations, focus drift, editor drift, expiry, and readback mismatch fail closed.

Built-in commands

• /editor-refine-bridge-status
• /triggers
• /trigger-enable <id>
• /trigger-disable <id>
• /trigger-diag
• /trigger-pick
• /trigger-reload

Release notes

• Publish target: packages/pi-interaction/pi-interaction
• Root/package release workflow: ../docs/dev/release-workflow.md
• Trusted publishing notes: ../docs/dev/trusted_publishing.md

Local stack surface

• Package-local stack guidance stays in docs/engineering.local.md.
• Lane metadata now stays root-owned at the monorepo level and is no longer shipped as policy/engineering-lane.json.

Environment flags

• PI_INTERACTION_ENABLED (0 disables runtime)
• PI_INTERACTION_LEGACY_MODE (1 skips editor override)
• PI_INTERACTION_EXAMPLES (0 disables built-in demo triggers such as !! / and !! .; PTX's $$ /... is not a built-in example here)

Legacy PI_INPUT_TRIGGERS_* aliases remain accepted for compatibility.