feat(web): add per-model temperature configuration

[brendan-kellam]

Summary

• Adds an optional temperature field to all 12 language model provider schemas, allowing temperature to be set per model
• Per-model temperature takes precedence over the SOURCEBOT_CHAT_MODEL_TEMPERATURE env var, which is now deprecated and defaults to undefined
• Threads temperature through getAISDKLanguageModelAndOptions → createMessageStream → createAgentStream → streamText

🤖 Generated with Claude Code

Summary by CodeRabbit

• New Features

  • Added optional per-model temperature configuration for all supported language model providers, enabling granular control of model behavior.

• Changed

  • The SOURCEBOT_CHAT_MODEL_TEMPERATURE environment variable is deprecated. Use per-model temperature configuration instead. When not configured, temperature defaults to API provider settings.

[coderabbitai]

Caution

Review failed

Pull request was closed or merged during review

Walkthrough

This PR adds a per-model temperature configuration option for all language model providers across the codebase. The global SOURCEBOT_CHAT_MODEL_TEMPERATURE environment variable is deprecated and changed to not provide a default value. Temperature settings are now threaded through the chat streaming pipeline from model configuration.

Changes

Cohort / File(s)	Summary
Schema & Documentation CHANGELOG.md, docs/snippets/schemas/v3/index.schema.mdx, docs/snippets/schemas/v3/languageModel.schema.mdx	Added changelog entries documenting the new per-model temperature configuration option and deprecation of SOURCEBOT_CHAT_MODEL_TEMPERATURE default fallback. Updated documentation schemas with the new field.
Schema Type Definitions packages/schemas/src/v3/index.type.ts, packages/schemas/src/v3/languageModel.type.ts	Added optional temperature?: number property to 12 language model provider interfaces (AmazonBedrock, Anthropic, Azure, DeepSeek, GoogleGenerativeAI, GoogleVertex*, Mistral, OpenAI, OpenAICompatible, OpenRouter, Xai).
Schema Implementations packages/schemas/src/v3/index.schema.ts, packages/schemas/src/v3/languageModel.schema.ts, schemas/v3/languageModel.json	Added optional temperature numeric property (with description "Optional temperature setting to use with the model.") to all 12 provider-specific model configuration schemas across schema definitions and oneOf branches.
Environment Configuration Deprecation packages/shared/src/env.server.ts	Changed SOURCEBOT_CHAT_MODEL_TEMPERATURE from numberSchema.default(0.3) to numberSchema.optional() with JSDoc deprecation notice directing users to per-model temperature configuration.
Chat Pipeline Integration packages/web/src/app/api/(server)/chat/route.ts, packages/web/src/features/chat/utils.server.ts, packages/web/src/features/chat/agent.ts, packages/web/src/features/mcp/askCodebase.ts	Updated getAISDKLanguageModelAndOptions to extract and return temperature from model config. Threaded temperature as modelTemperature through createMessageStream and createAgentStream to the streamText invocation, allowing per-model temperature override of environment variable fallback.

Sequence Diagram

sequenceDiagram
    participant RouteHandler as Route Handler
    participant UtilsServer as getAISDKLanguageModelAndOptions
    participant Agent as createMessageStream/Agent
    participant StreamText as streamText (AI SDK)

    RouteHandler->>UtilsServer: getAISDKLanguageModelAndOptions(languageModelConfig)
    UtilsServer-->>RouteHandler: { model, providerOptions, temperature }
    RouteHandler->>Agent: createMessageStream({ model, modelTemperature: temperature, ... })
    Agent->>StreamText: streamText({ ..., temperature: temperature ?? env.SOURCEBOT_CHAT_MODEL_TEMPERATURE })
    StreamText-->>Agent: stream response
    Agent-->>RouteHandler: message stream

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Estimated code review effort

🎯 3 (Moderate) | ⏱️ ~20 minutes

Possibly related PRs

• PR #1101: Also modifies getAISDKLanguageModelAndOptions to return additional per-model/provider options (adds reasoningEffort alongside the temperature added here).
• PR #424: Introduces the openai-compatible provider (schema, types, and handler logic), which is now extended with per-model temperature support in this PR.
• PR #976: Modifies the same chat stack functions (getAISDKLanguageModelAndOptions, createMessageStream in agent.ts) that are updated here for temperature threading.

Suggested reviewers

• msukkari
• Ferexx

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'feat(web): add per-model temperature configuration' accurately and concisely summarizes the main change: introducing a new per-model temperature configuration feature across language model providers.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

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✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch brendan/add-per-model-temperature

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