Allow Inngest Functions to be passed as Sandbox tools

[jpwilliams]

Summary

An Inngest function, or a referenceFunction() to one, can now be a Sandbox tool. The code calls it with named arguments, which become the event data, and gets the function's result back. The invoke is a durable step.

import { eventType } from "inngest";

const refund = inngest.createFunction(
  {
    id: "refund",
    triggers: [
      eventType("order/refund", { schema: z.object({ orderId: z.string() }) }),
    ],
  },
  async ({ event }) => issueRefund(event.data.orderId),
);

await sandbox.commands.run("agent", "node agent.js", {
  tools: { refund },
});

Checklist

• Added a docs PR that references this PR N/A
• Added unit/integration tests
• Added changesets if applicable

[changeset-bot]

🦋 Changeset detected

Latest commit: 758ec20

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

This PR includes changesets to release 1 package

Name	Type
inngest	Patch

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[greptile-apps]

Confidence Score: 4/5

[Medium impact] Adds Inngest functions as sandbox tools.

Fix schema selection for wrapped event triggers before merging.

Findings

1.  Wrapped triggers skip argument checks ▶

Fix with agent prompt

### Issue 1
packages/inngest/src/components/sandbox/tools.ts:234-238
`triggerSchema()` misses schemas in supported triggers such as `{ event: eventType("order/refund", { schema }) }`. The schema lives on `trigger.event.schema`, not `trigger.schema`. These functions fall back to `z.record(z.unknown())`, so `{ orderId: 5 }` reaches `step.invoke()` despite a declared string schema. The handler receives invalid data instead of the sandbox getting an argument error.

Read wrapped event types before selecting the schema, and add a test for this trigger form.

---

For each issue above, determine whether it is valid and should be fixed. If so, fix it directly.

Summary

Adds Inngest functions and referenceFunction() references as sandbox tools.

• Sandbox tools can invoke Inngest functions and return their results.

Diagram

%%{init: {'theme': 'neutral'}}%%
flowchart TD
  A[Sandbox tool call] --> B[Resolve registered tool]
  B --> C[Select trigger schema or record fallback]
  C --> D{Arguments accepted?}
  D -->|No| E[Reply with argument error]
  D -->|Yes| F[Set tool call step prefix]
  F --> G[step.invoke]
  G --> H[Reply with function result]

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_{Reviews (1) · Last reviewed commit: "feat(sandbox): an Inngest function as a ..." · Reviewed by Greptile}