Edit draft config (prompt, tools, post-call metrics, voice, etc.)

**Deprecated on the v2 branch model.** Migrate to `PUT /agent/{id}/branches/{branchId}/draft`. When `ENABLE_BRANCH_MODEL` is on, this endpoint returns `409 versioning_v2_migration_required` with the `Deprecation: true` header. See the [migration guide](/voice-agents/deprecations/agent-versioning-migration). | Update the configuration of a draft. This single endpoint is how every agent-level config field is changed: prompt, tools, voice, language, **post-call analytics (disposition metrics)**, and more. There is no standalone post-call-analytics endpoint — it lives here as the `postCallAnalyticsConfig` body field. ## Post-Call Analytics Pass a `postCallAnalyticsConfig` object to configure disposition metrics (STRING, BOOLEAN, INTEGER, ENUM, DATETIME) that are automatically extracted from each completed call, along with the `useInternalAnalyticsModel` and `useReasoningModel` flags. See the [Post-Call Metrics guide](/atoms/atoms-platform/features/post-call-metrics) for a full Python walkthrough and disposition metric schema reference. ## Full payload Accepts the full agent-shaped config payload (language, synthesizer, slmModel, defaultVariables, preCallAPI, etc.) plus two draft-specific fields: - `singlePromptConfig` — prompt and tools (end_call, transfer_call, api_call, extract_dynamic_variables, knowledge_base_search). - `postCallAnalyticsConfig` — disposition metrics + analytics/ reasoning model flags. Each PATCH increments the draft's revision counter. Config is not live until the draft is published and activated (see `/drafts/{draftId}/publish` and `/versions/{versionId}/activate`).