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fix(agent): keep browser tool schema object-based #265

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iamjr15 merged 1 commit into from
Aug 12, 2026
Merged

fix(agent): keep browser tool schema object-based #265

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26 changes: 21 additions & 5 deletions packages/agent-core/src/tools/browser/browser-action-contract-support.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -61,11 +61,27 @@ export const BrowserBoundActionSchema = z.union([
}),
]);

// Provider and driver share one method-specific contract. Placeholder nulls add no runtime safety
// and are emitted inconsistently across otherwise compatible model transports.
export const BrowserActInputSchema = BrowserBoundActionSchema.describe(
"One method-specific action using an exact ref from the latest browser tree.",
);
// Tool providers require a top-level object schema. Keep the provider-facing shape object-based,
// then narrow it to the driver's method-specific union before crossing the sandbox boundary.
export const BrowserActInputSchema = z
.strictObject({
method: BrowserActionMethodSchema.describe("Deterministic action to perform on the ref."),
ref: BrowserElementRefSchema,
targetRef: BrowserElementRefSchema.optional().describe(
"Destination ref. Required only for dragAndDrop; omit for every other method.",
),
value: z
.string()
.max(2_000)
.optional()
.describe(
"Text, key, option, or percentage. Required for fill, press, scrollTo, selectOptionFromDropdown, and type; omit otherwise.",
),
})
.refine((input) => BrowserBoundActionSchema.safeParse(input).success, {
message: "The selected browser method requires its exact method-specific fields.",
})
.describe("One method-specific action using an exact ref from the latest browser tree.");

export function browserBoundActionFromInput(
input: z.infer<typeof BrowserActInputSchema>,
Expand Down