diff --git a/action.yml b/action.yml
index 5b33ef3..128f5db 100644
--- a/action.yml
+++ b/action.yml
@@ -7,15 +7,6 @@ inputs:
     description: "Prompt to send to Claude Code"
     required: true
     default: "Hello from Claude Code!"
-  defaultAgent:
-    description: "Default agent to use. Overridden by payload.agent if present."
-    required: false
-    type: choice
-    options:
-      - claude
-      - codex
-      - cursor
-      - gemini
   anthropic_api_key:
     description: "Anthropic API key for Claude Code authentication"
     required: false
diff --git a/entry.ts b/entry.ts
index 6f9d77c..74d3667 100644
--- a/entry.ts
+++ b/entry.ts
@@ -7,7 +7,7 @@
 import * as core from "@actions/core";
 import { flatMorph } from "@ark/util";
 import { agents } from "./agents/index.ts";
-import { AgentName, type Inputs, main } from "./main.ts";
+import { type Inputs, main } from "./main.ts";
 import { log } from "./utils/cli.ts";
 
 async function run(): Promise<void> {
@@ -22,7 +22,6 @@ async function run(): Promise<void> {
   try {
     const inputs: Required<Inputs> = {
       prompt: core.getInput("prompt", { required: true }),
-      defaultAgent: core.getInput("defaultAgent") ? AgentName.assert(core.getInput("defaultAgent")) : undefined,
       ...flatMorph(agents, (_, agent) =>
         agent.apiKeyNames.map((inputKey) => [inputKey, core.getInput(inputKey)])
       ),
diff --git a/main.ts b/main.ts
index 365047b..2cbae6f 100644
--- a/main.ts
+++ b/main.ts
@@ -5,6 +5,7 @@ import { join } from "node:path";
 import { flatMorph } from "@ark/util";
 import { type } from "arktype";
 import { agents } from "./agents/index.ts";
+import type { AgentResult } from "./agents/shared.ts";
 import type { AgentName, AgentName as AgentNameType, Payload } from "./external.ts";
 import { createMcpConfigs } from "./mcp/config.ts";
 import { modes } from "./modes.ts";
@@ -35,9 +36,6 @@ const keyInputDefs = flatMorph(agents, (_, agent) =>
 export const Inputs = type({
   prompt: "string",
   ...keyInputDefs,
-  "defaultAgent?": type
-    .enumerated(...Object.values(agents).map((agent) => agent.name))
-    .or("undefined"),
 });
 
 export type Inputs = typeof Inputs.infer;
@@ -177,11 +175,9 @@ async function determineAgent(
     repoContext: ctx.repoContext,
   });
 
-  // precedence: override agent > payload.agent > inputs.defaultAgent > repoSettings.defaultAgent > "claude"
   ctx.agentName =
     (process.env.NODE_ENV === "development" && AGENT_OVERRIDE) ||
     ctx.payload.agent ||
-    ctx.inputs.defaultAgent ||
     repoSettings.defaultAgent ||
     "claude"; // TODO: look at env vars
   ctx.agent = agents[ctx.agentName];
@@ -242,9 +238,7 @@ async function installAgentCli(ctx: MainContext): Promise<void> {
 }
 
 function validateApiKey(ctx: MainContext): void {
-  const matchingInputKey = ctx.agent.apiKeyNames.find(
-    (inputKey: string) => ctx.inputs[inputKey as AgentInputKey]
-  );
+  const matchingInputKey = ctx.agent.apiKeyNames.find((inputKey) => ctx.inputs[inputKey]);
   if (!matchingInputKey) {
     throwMissingApiKeyError({
       agentName: ctx.agentName,
@@ -253,10 +247,10 @@ function validateApiKey(ctx: MainContext): void {
       inputs: ctx.inputs,
     });
   }
-  ctx.apiKey = ctx.inputs[matchingInputKey as AgentInputKey]!;
+  ctx.apiKey = ctx.inputs[matchingInputKey]!;
 }
 
-async function runAgent(ctx: MainContext): Promise<import("./agents/shared.ts").AgentResult> {
+async function runAgent(ctx: MainContext): Promise<AgentResult> {
   log.info(`Running ${ctx.agentName}...`);
   log.box(ctx.payload.prompt, { title: "Prompt" });
 
@@ -269,9 +263,7 @@ async function runAgent(ctx: MainContext): Promise<import("./agents/shared.ts").
   });
 }
 
-async function handleAgentResult(
-  result: import("./agents/shared.ts").AgentResult
-): Promise<MainResult> {
+async function handleAgentResult(result: AgentResult): Promise<MainResult> {
   if (!result.success) {
     return {
       success: false,
diff --git a/play.ts b/play.ts
index da8dbad..5dd600f 100644
--- a/play.ts
+++ b/play.ts
@@ -27,7 +27,6 @@ export async function run(prompt: string): Promise<AgentResult> {
     // we don't need to extract it here since main() will parse the payload
     const inputs: Required<Inputs> = {
       prompt,
-      defaultAgent: "gemini",
       ...flatMorph(agents, (_, agent) =>
         agent.apiKeyNames.map((inputKey) => [inputKey, process.env[inputKey.toUpperCase()]])
       ),
diff --git a/utils/api.ts b/utils/api.ts
index cd6c7ff..7cfc4c7 100644
--- a/utils/api.ts
+++ b/utils/api.ts
@@ -1,5 +1,4 @@
 import type { AgentName } from "../external.ts";
-import { log } from "./cli.ts";
 import type { RepoContext } from "./github.ts";
 
 export interface Mode {