Use published Pi version and clean up the PiHarness options

[aron-cf]

This PR now pins the @earendil-works/pi-durable package rather than vendoring it and cleans up the PiHarness options.

import { createRegistry, Harness } from "@earendil-works/pi-durable";

export class PiAgent extends DurableObject<Env> {
  readonly registry = (() => {
    const registry = createRegistry();
    registry.systemPrompt.section("preamble", () => "Be concise.", { tag: false });
    for (const tool of createTools()) registry.tools.add(tool);
    return registry;
  })();

  readonly harness = new PiHarness({
    harness: ({ storage, context }) =>
      Harness.open(
        storage,
        {
          models: createModels({ providers: [workersAI(this.env.AI)] }),
          registry: this.registry
        },
        context
      ),
    defaults: {
      model: { provider: "cloudflare-workers-ai", modelId: MODEL_ID }
    }
  });

  readonly lifecycle = Lifecycle.install(this).use(this.harness);
}

Only harness is required:

• defaults sets the model, thinking level and retry policy for new sessions. If no model is set, a session's prompts end unanswered with reason no_model until you call setModel.
• store changes the table prefix, which defaults to pi_.
• timing changes how long the wake job waits.

---

[changeset-bot]

🦋 Changeset detected

Latest commit: 048df07

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 1 package

Name	Type
@cloudflare/worker-bundler	Patch

Not sure what this means? Click here to learn what changesets are.

Click here if you're a maintainer who wants to add another changeset to this PR

[agent-think]

🟡 agents import sizes: 2 entry points grew

	Entry point	Exports	Largest gzip change	Size now
🟡	agents/browser/tanstack-ai	1 resized	+1.2 KiB (+0.71%)	164.3 KiB
🟡	agents/browser/ai	3 resized, 1 new	up to +1.1 KiB (+0.75%)	148.5 KiB
🆕	agents/browser	3 new	—	40.5 KiB
🟢	agents/vite	1 resized	-121.3 KiB (-28.96%)	297.6 KiB

Changed exports (9)

	Import	Gzip change	Size now
🟡	agents/browser/tanstack-ai#createBrowserTools	+1.2 KiB (+0.71%)	164.3 KiB
🟡	agents/browser/ai#createBrowserRuntime	+1.1 KiB (+0.75%)	148.5 KiB
🟡	agents/browser/ai#createBrowserTools	+1.1 KiB (+0.75%)	148.5 KiB
🟡	agents/browser/ai#createQuickActionTools	+1 KiB (+0.82%)	123.5 KiB
🆕	agents/browser/ai#browserTool	—	141 KiB
🆕	agents/browser#Browser	—	40.5 KiB
🆕	agents/browser#CdpConnection	—	37.4 KiB
🆕	agents/browser#browserRun	—	36 KiB
🟢	agents/vite#default	-121.3 KiB (-28.96%)	297.6 KiB

How this works

Each runtime export is bundled on its own, minified, and gzipped. Changes smaller than 100 B, or smaller than 1% and 1 KiB, are ignored. Growth over 10% or 5 KiB is marked 🔴. This report is informational and does not fail CI. The workflow artifact contains every measurement.

_{Compared 3c6a1d08 → 048df074 · workflow run · reported by agent-think[bot]}

[aron-cf]

@agent-think can you bump the pi-recovery dependency to the same pi version as used by this branch to avoid the serif issue.

[devin-ai-integration]

Devin Review found 1 new potential issue.

[devin-ai-integration]

🔍 Validate mixed Pi package versions

The override pairs pi-agent-core@0.80.2 with pi-ai@0.99.2 in the recovery fixture. Its streaming recovery path needs runtime validation against this pairing.

---

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commit: 048df07