v0.5.52: new port-based router block, combobox expression and variable support

[waleedlatif1]

• fix(build): fix type assertion (fix(build): fix type assertion #2696)
• improvement(router): add ports to router block (improvement(router): add ports to router block #2683)
• feat(combobox): added expression support to combobox (feat(combobox): added expression support to combobox #2697)

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1 Skipped Deployment

Project	Deployment	Review	Updated (UTC)
docs	Skipped		Jan 7, 2026 0:03am

[greptile-apps]

Greptile Summary

This PR bundles three changes:

• Port-based Router Block (router_v2): Introduces a new routing mechanism that uses route definitions with natural language descriptions instead of relying on downstream block names. The LLM evaluates context against route descriptions to make routing decisions. The legacy router is preserved but hidden from the toolbar.

• Combobox Expression Support: Enhanced the combobox component to accept expressions (like <block.output>) directly, store raw values when no matching option exists, and support async option fetching with hydration via fetchOptionById.

• Type Assertion Fix: Corrected the ToolConfig.request.body type signature to include FormData and undefined return types, fixing build errors.

Confidence Score: 4/5

• This PR is safe to merge with minor attention to combobox edge cases
• The changes are well-structured and follow existing patterns. The router_v2 implementation mirrors the legacy router handler. Type fixes are straightforward. The combobox expression support adds complexity but handles edge cases reasonably.
• Pay attention to combobox.tsx and condition-input.tsx for edge case handling

Important Files Changed

Filename	Overview
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/combobox/combobox.tsx	Added expression support, async fetchOptions, fetchOptionById for hydration, and dependency tracking. Allows storing raw values when no option matches (for expressions like <block.output>).
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/panel/components/editor/components/sub-block/components/condition-input/condition-input.tsx	Added mode prop to support both condition (code editor) and router (text input) modes. Router mode uses Textarea with tag/env var support instead of code editor.
apps/sim/app/workspace/[workspaceId]/w/[workflowId]/components/workflow-block/workflow-block.tsx	Added router_v2 block support with per-route handles, context row, and separate route rows with dynamic output handles per route.
apps/sim/blocks/blocks/router.ts	Added RouterV2Block with port-based routing, generateRouterV2Prompt function, and helper functions. Legacy router hidden from toolbar.
apps/sim/executor/handlers/router/router-handler.ts	Split execution into executeLegacy and executeV2 methods. V2 uses route definitions with descriptions for LLM-based routing.
apps/sim/tools/types.ts	Updated body function signature in ToolConfig.request to include FormData and undefined return types.

Sequence Diagram

sequenceDiagram
    participant User
    participant WorkflowBlock
    participant ConditionInput
    participant RouterHandler
    participant ProviderAPI

    Note over User,ProviderAPI: Router V2 Flow (Port-based)
    
    User->>WorkflowBlock: Create router_v2 block
    WorkflowBlock->>ConditionInput: Render in router mode
    ConditionInput-->>User: Display route textareas
    User->>ConditionInput: Define route descriptions
    
    Note over RouterHandler: Execution Phase
    RouterHandler->>RouterHandler: parseRoutes(inputs.routes)
    RouterHandler->>RouterHandler: generateRouterV2Prompt(context, routes)
    RouterHandler->>ProviderAPI: POST /api/providers
    ProviderAPI-->>RouterHandler: Selected route ID
    RouterHandler->>RouterHandler: Find connection by router-{routeId} handle
    RouterHandler-->>WorkflowBlock: Execute target block

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