Add gemini-3.8-flash to Gemini CUA, HyperAgent, and Browser Use LLM types

[shrisukhani]

Summary

Adds "gemini-3.8-flash" to GeminiComputerUseLlm, HyperAgentLlm, and BrowserUseLlm. Server support: hyperbrowserai/browserctrl#1385 (it is now the server-side default for Gemini Computer Use).

Changes

• src/types/constants.ts: new "gemini-3.8-flash" literal in the three LLM union types.

Validation

• corepack yarn build

Link to Devin session: https://app.devin.ai/sessions/7dccc05e05b04c63bd5760859b161275
Open in Devin Desktop: https://app.devin.ai/desktop/session/7dccc05e05b04c63bd5760859b161275?variant=devin
Requested by: @shrisukhani

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Note

Low Risk
Additive type and JSON-schema enum updates only; no auth, data, or execution logic changes.

Overview
Adds gemini-3.8-flash as a selectable model across client types and tool schemas so agents can target the newer Gemini flash model (aligned with server default in browserctrl#1385).

In src/types/constants.ts, the literal is added to BrowserUseLlm, HyperAgentLlm, and GeminiComputerUseLlm. In src/tools/schema.ts, the same value is included in BROWSER_USE_LLM_SCHEMA for llm, plannerLlm, and pageExtractionLlm on browser-use tools. Existing defaults remain gemini-2.0-flash for browser use.

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[devin-ai-integration]

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[greptile-apps]

Greptile Summary

Adds gemini-3.8-flash to the public LLM type unions and completes the prior fix by allowing that value in the strict Browser Use tool schema.

• Extends BrowserUseLlm, HyperAgentLlm, and GeminiComputerUseLlm.
• Adds the new identifier to BROWSER_USE_LLM_SCHEMA for llm, plannerLlm, and pageExtractionLlm.

Confidence Score: 5/5

The PR appears safe to merge.

No blocking failure remains.

Important Files Changed

Filename	Overview
src/types/constants.ts	Adds the new model identifier to all three intended TypeScript unions without changing runtime behavior.
src/tools/schema.ts	Adds the model identifier to the shared Browser Use schema enum, resolving the previously reported strict-validation mismatch.

_{Reviews (2): Last reviewed commit: "Add gemini-3.8-flash to browser-use tool..." | Re-trigger Greptile}

[greptile-apps]

Browser-use schema rejects new model

When an OpenAI or Anthropic strict tool definition selects gemini-3.8-flash for llm, plannerLlm, or pageExtractionLlm, BrowserUseLlm accepts the value but BROWSER_USE_LLM_SCHEMA omits it, causing strict validation to reject or exclude the newly supported model.

Prompt To Fix With AI

This is a comment left during a code review.
Path: src/types/constants.ts
Line: 52

Comment:
**Browser-use schema rejects new model**

When an OpenAI or Anthropic strict tool definition selects `gemini-3.8-flash` for `llm`, `plannerLlm`, or `pageExtractionLlm`, `BrowserUseLlm` accepts the value but `BROWSER_USE_LLM_SCHEMA` omits it, causing strict validation to reject or exclude the newly supported model.

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