feat: add agent node type with tool calling

[benzend]

Summary

• Adds a new agent workflow node type that supports autonomous AI execution with an agentic loop
• Agents can call existing integrations (email, Slack, HTTP, GitHub, etc.) and user-defined custom API endpoints as tools
• Configurable model, temperature (0–2), max steps (1–20), system/user prompts with variable autocomplete
• Full sidebar config panel with tool picker UI (integration checklist + custom API form)
• Agent outputs (output, tool_calls, last_tool_result) available to downstream nodes via {{agent_label.field}}

New files

• lib/agent-tools.ts — Bridges AgentToolConfig to Vercel AI SDK tool definitions
• lib/agent-executor.ts — Core agent loop using generateText() + stopWhen(stepCountIs(N))
• components/reactflow-nodes/AgentNode.tsx — Canvas node with tool count badge
• components/AgentToolPicker.tsx — Tool selection UI

Modified files

• lib/workflow-types.ts — AgentNodeConfig/AgentToolConfig interfaces
• lib/node-registry.ts — Agent registry entry with defaults
• lib/node-outputs.ts — Agent output variables
• pages/api/workflow/[id]/execute.ts — Agent execution case
• components/WorkflowBuilderReactFlow.tsx — Full agent sidebar config panel
• lib/agentic-chat.ts, lib/workflow-parser.ts — Added agent to node type enums

Test plan

• Create a workflow with an agent node from the node palette
• Configure model, temperature, max steps, system/user prompts
• Add integration tools (e.g., HTTP Request) and verify they appear in the tool list
• Add a custom API tool with endpoint and parameter schema
• Save and reload the workflow — verify agent config persists
• Execute the workflow and verify the agent calls tools and produces output
• Verify downstream nodes can reference {{agent.output}} variables
• TypeScript compiles cleanly, no new lint errors

🤖 Generated with Claude Code

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Project	Deployment	Actions	Updated (UTC)
joice	Error		Mar 23, 2026 1:40pm