refactor: complete v1.0 simplification by removing all legacy inputs

- Remove all backward compatibility for v1.0 simplification
- Remove 10 legacy inputs from base-action/action.yml
- Remove 9 legacy inputs from main action.yml
- Simplify ClaudeOptions type to just timeoutMinutes and claudeArgs
- Remove all legacy option handling from prepareRunConfig
- Update tests to remove references to deleted fields
- Remove obsolete test file github/context.test.ts
- Clean up types to remove customInstructions, allowedTools, disallowedTools

Users now use claudeArgs exclusively for CLI control.

base-action/action.yml

@@ -14,47 +14,10 @@ inputs:
     description: "Path to a file containing the prompt to send to Claude Code (mutually exclusive with prompt)"
     required: false
     default: ""
-  allowed_tools:
-    description: "Comma-separated list of allowed tools for Claude Code to use"
-    required: false
-    default: ""
-  disallowed_tools:
-    description: "Comma-separated list of disallowed tools that Claude Code cannot use"
-    required: false
-    default: ""
-  max_turns:
-    description: "Maximum number of conversation turns (default: no limit)"
-    required: false
-    default: ""
-  mcp_config:
-    description: "MCP configuration as JSON string or path to MCP configuration JSON file"
-    required: false
-    default: ""
   settings:
     description: "Claude Code settings as JSON string or path to settings JSON file"
     required: false
     default: ""
-  system_prompt:
-    description: "Override system prompt"
-    required: false
-    default: ""
-  append_system_prompt:
-    description: "Append to system prompt"
-    required: false
-    default: ""
-  model:
-    description: "Model to use (provider-specific format required for Bedrock/Vertex)"
-    required: false
-  anthropic_model:
-    description: "DEPRECATED: Use 'model' instead. Model to use (provider-specific format required for Bedrock/Vertex)"
-    required: false
-  fallback_model:
-    description: "Enable automatic fallback to specified model when default model is unavailable"
-    required: false
-  claude_env:
-    description: "Custom environment variables to pass to Claude Code execution (YAML multiline format)"
-    required: false
-    default: ""
 
   # Action settings
   timeout_minutes:
@@ -137,19 +100,11 @@ runs:
       env:
         # Model configuration
         CLAUDE_CODE_ACTION: "1"
-        ANTHROPIC_MODEL: ${{ inputs.model || inputs.anthropic_model }}
         INPUT_PROMPT: ${{ inputs.prompt }}
         INPUT_PROMPT_FILE: ${{ inputs.prompt_file }}
-        INPUT_ALLOWED_TOOLS: ${{ inputs.allowed_tools }}
-        INPUT_DISALLOWED_TOOLS: ${{ inputs.disallowed_tools }}
-        INPUT_MAX_TURNS: ${{ inputs.max_turns }}
-        INPUT_MCP_CONFIG: ${{ inputs.mcp_config }}
         INPUT_SETTINGS: ${{ inputs.settings }}
-        INPUT_SYSTEM_PROMPT: ${{ inputs.system_prompt }}
-        INPUT_APPEND_SYSTEM_PROMPT: ${{ inputs.append_system_prompt }}
         INPUT_TIMEOUT_MINUTES: ${{ inputs.timeout_minutes }}
-        INPUT_CLAUDE_ENV: ${{ inputs.claude_env }}
-        INPUT_FALLBACK_MODEL: ${{ inputs.fallback_model }}
+        INPUT_CLAUDE_ARGS: ${{ inputs.claude_args }}
         INPUT_EXPERIMENTAL_SLASH_COMMANDS_DIR: ${{ inputs.experimental_slash_commands_dir }}
 
         # Provider configuration

base-action/src/index.ts

@@ -22,15 +22,7 @@ async function run() {
     });
 
     await runClaude(promptConfig.path, {
-      allowedTools: process.env.INPUT_ALLOWED_TOOLS,
-      disallowedTools: process.env.INPUT_DISALLOWED_TOOLS,
-      maxTurns: process.env.INPUT_MAX_TURNS,
-      mcpConfig: process.env.INPUT_MCP_CONFIG,
-      systemPrompt: process.env.INPUT_SYSTEM_PROMPT,
-      appendSystemPrompt: process.env.INPUT_APPEND_SYSTEM_PROMPT,
-      claudeEnv: process.env.INPUT_CLAUDE_ENV,
-      fallbackModel: process.env.INPUT_FALLBACK_MODEL,
-      model: process.env.ANTHROPIC_MODEL,
+      timeoutMinutes: process.env.INPUT_TIMEOUT_MINUTES,
       claudeArgs: process.env.INPUT_CLAUDE_ARGS,
     });
   } catch (error) {

base-action/src/run-claude.ts

@@ -10,20 +10,10 @@ const execAsync = promisify(exec);
 
 const PIPE_PATH = `${process.env.RUNNER_TEMP}/claude_prompt_pipe`;
 const EXECUTION_FILE = `${process.env.RUNNER_TEMP}/claude-execution-output.json`;
-// These base args are always appended at the end
 const BASE_ARGS = ["--verbose", "--output-format", "stream-json"];
 
 export type ClaudeOptions = {
-  allowedTools?: string;
-  disallowedTools?: string;
-  maxTurns?: string;
-  mcpConfig?: string;
-  systemPrompt?: string;
-  appendSystemPrompt?: string;
-  claudeEnv?: string;
-  fallbackModel?: string;
   timeoutMinutes?: string;
-  model?: string;
   claudeArgs?: string;
 };
 
@@ -33,48 +23,19 @@ type PreparedConfig = {
   env: Record<string, string>;
 };
 
-function parseCustomEnvVars(claudeEnv?: string): Record<string, string> {
-  if (!claudeEnv || claudeEnv.trim() === "") {
-    return {};
-  }
-
-  const customEnv: Record<string, string> = {};
-
-  // Split by lines and parse each line as KEY: VALUE
-  const lines = claudeEnv.split("\n");
-
-  for (const line of lines) {
-    const trimmedLine = line.trim();
-    if (trimmedLine === "" || trimmedLine.startsWith("#")) {
-      continue; // Skip empty lines and comments
-    }
-
-    const colonIndex = trimmedLine.indexOf(":");
-    if (colonIndex === -1) {
-      continue; // Skip lines without colons
-    }
-
-    const key = trimmedLine.substring(0, colonIndex).trim();
-    const value = trimmedLine.substring(colonIndex + 1).trim();
-
-    if (key) {
-      customEnv[key] = value;
-    }
-  }
-
-  return customEnv;
-}
-
 export function prepareRunConfig(
   promptPath: string,
   options: ClaudeOptions,
 ): PreparedConfig {
-  // Build arguments in correct order:
-  // 1. -p flag for prompt via pipe
+  // Build Claude CLI arguments:
+  // 1. Prompt flag (always first)
+  // 2. User's claudeArgs (full control)
+  // 3. BASE_ARGS (always last, cannot be overridden)
+
   const claudeArgs = ["-p"];
 
-  // 2. User's custom arguments (can override defaults)
-  if (options.claudeArgs && options.claudeArgs.trim() !== "") {
+  // Parse and add user's custom Claude arguments
+  if (options.claudeArgs?.trim()) {
     const parsed = parseShellArgs(options.claudeArgs);
     const customArgs = parsed.filter(
       (arg): arg is string => typeof arg === "string",
@@ -82,34 +43,7 @@ export function prepareRunConfig(
     claudeArgs.push(...customArgs);
   }
 
-  // 3. Legacy specific options for backward compatibility
-  // These will eventually be removed in favor of claudeArgs
-  if (options.allowedTools) {
-    claudeArgs.push("--allowedTools", options.allowedTools);
-  }
-  if (options.disallowedTools) {
-    claudeArgs.push("--disallowedTools", options.disallowedTools);
-  }
-  if (options.maxTurns) {
-    claudeArgs.push("--max-turns", options.maxTurns);
-  }
-  if (options.mcpConfig) {
-    claudeArgs.push("--mcp-config", options.mcpConfig);
-  }
-  if (options.systemPrompt) {
-    claudeArgs.push("--system-prompt", options.systemPrompt);
-  }
-  if (options.appendSystemPrompt) {
-    claudeArgs.push("--append-system-prompt", options.appendSystemPrompt);
-  }
-  if (options.fallbackModel) {
-    claudeArgs.push("--fallback-model", options.fallbackModel);
-  }
-  if (options.model) {
-    claudeArgs.push("--model", options.model);
-  }
-
-  // 4. Base args always at the end
+  // BASE_ARGS are always appended last (cannot be overridden)
   claudeArgs.push(...BASE_ARGS);
 
   // Validate timeout if provided (affects process wrapper, not Claude)
@@ -122,13 +56,10 @@ export function prepareRunConfig(
     }
   }
 
-  // Parse custom environment variables
-  const customEnv = parseCustomEnvVars(options.claudeEnv);
-
   return {
     claudeArgs,
     promptPath,
-    env: customEnv,
+    env: {},
   };
 }
 

base-action/test/run-claude.test.ts

@@ -23,79 +23,6 @@ describe("prepareRunConfig", () => {
     expect(prepared.promptPath).toBe("/tmp/test-prompt.txt");
   });
 
-  test("should include allowed tools in command arguments", () => {
-    const options: ClaudeOptions = {
-      allowedTools: "Bash,Read",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--allowedTools");
-    expect(prepared.claudeArgs).toContain("Bash,Read");
-  });
-
-  test("should include disallowed tools in command arguments", () => {
-    const options: ClaudeOptions = {
-      disallowedTools: "Bash,Read",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--disallowedTools");
-    expect(prepared.claudeArgs).toContain("Bash,Read");
-  });
-
-  test("should include max turns in command arguments", () => {
-    const options: ClaudeOptions = {
-      maxTurns: "5",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--max-turns");
-    expect(prepared.claudeArgs).toContain("5");
-  });
-
-  test("should include mcp config in command arguments", () => {
-    const options: ClaudeOptions = {
-      mcpConfig: "/path/to/mcp-config.json",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--mcp-config");
-    expect(prepared.claudeArgs).toContain("/path/to/mcp-config.json");
-  });
-
-  test("should include system prompt in command arguments", () => {
-    const options: ClaudeOptions = {
-      systemPrompt: "You are a senior backend engineer.",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--system-prompt");
-    expect(prepared.claudeArgs).toContain("You are a senior backend engineer.");
-  });
-
-  test("should include append system prompt in command arguments", () => {
-    const options: ClaudeOptions = {
-      appendSystemPrompt:
-        "After writing code, be sure to code review yourself.",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--append-system-prompt");
-    expect(prepared.claudeArgs).toContain(
-      "After writing code, be sure to code review yourself.",
-    );
-  });
-
-  test("should include fallback model in command arguments", () => {
-    const options: ClaudeOptions = {
-      fallbackModel: "claude-sonnet-4-20250514",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toContain("--fallback-model");
-    expect(prepared.claudeArgs).toContain("claude-sonnet-4-20250514");
-  });
-
   test("should use provided prompt path", () => {
     const options: ClaudeOptions = {};
     const prepared = prepareRunConfig("/custom/prompt/path.txt", options);
@@ -103,105 +30,6 @@ describe("prepareRunConfig", () => {
     expect(prepared.promptPath).toBe("/custom/prompt/path.txt");
   });
 
-  test("should not include optional arguments when not set", () => {
-    const options: ClaudeOptions = {};
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).not.toContain("--allowedTools");
-    expect(prepared.claudeArgs).not.toContain("--disallowedTools");
-    expect(prepared.claudeArgs).not.toContain("--max-turns");
-    expect(prepared.claudeArgs).not.toContain("--mcp-config");
-    expect(prepared.claudeArgs).not.toContain("--system-prompt");
-    expect(prepared.claudeArgs).not.toContain("--append-system-prompt");
-    expect(prepared.claudeArgs).not.toContain("--fallback-model");
-  });
-
-  test("should preserve order of claude arguments", () => {
-    const options: ClaudeOptions = {
-      allowedTools: "Bash,Read",
-      maxTurns: "3",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toEqual([
-      "-p",
-      "--allowedTools",
-      "Bash,Read",
-      "--max-turns",
-      "3",
-      "--verbose",
-      "--output-format",
-      "stream-json",
-    ]);
-  });
-
-  test("should preserve order with all options including fallback model", () => {
-    const options: ClaudeOptions = {
-      allowedTools: "Bash,Read",
-      disallowedTools: "Write",
-      maxTurns: "3",
-      mcpConfig: "/path/to/config.json",
-      systemPrompt: "You are a helpful assistant",
-      appendSystemPrompt: "Be concise",
-      fallbackModel: "claude-sonnet-4-20250514",
-    };
-    const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-    expect(prepared.claudeArgs).toEqual([
-      "-p",
-      "--allowedTools",
-      "Bash,Read",
-      "--disallowedTools",
-      "Write",
-      "--max-turns",
-      "3",
-      "--mcp-config",
-      "/path/to/config.json",
-      "--system-prompt",
-      "You are a helpful assistant",
-      "--append-system-prompt",
-      "Be concise",
-      "--fallback-model",
-      "claude-sonnet-4-20250514",
-      "--verbose",
-      "--output-format",
-      "stream-json",
-    ]);
-  });
-
-  describe("maxTurns handling", () => {
-    test("should accept valid maxTurns value", () => {
-      const options: ClaudeOptions = { maxTurns: "5" };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.claudeArgs).toContain("--max-turns");
-      expect(prepared.claudeArgs).toContain("5");
-    });
-
-    test("should pass through non-numeric maxTurns without validation (v1.0)", () => {
-      const options: ClaudeOptions = { maxTurns: "abc" };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      // v1.0: No validation - let Claude handle it
-      expect(prepared.claudeArgs).toContain("--max-turns");
-      expect(prepared.claudeArgs).toContain("abc");
-    });
-
-    test("should pass through negative maxTurns without validation (v1.0)", () => {
-      const options: ClaudeOptions = { maxTurns: "-1" };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      // v1.0: No validation - let Claude handle it
-      expect(prepared.claudeArgs).toContain("--max-turns");
-      expect(prepared.claudeArgs).toContain("-1");
-    });
-
-    test("should pass through zero maxTurns without validation (v1.0)", () => {
-      const options: ClaudeOptions = { maxTurns: "0" };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      // v1.0: No validation - let Claude handle it
-      expect(prepared.claudeArgs).toContain("--max-turns");
-      expect(prepared.claudeArgs).toContain("0");
-    });
-  });
-
   describe("timeoutMinutes validation", () => {
     test("should accept valid timeoutMinutes value", () => {
       const options: ClaudeOptions = { timeoutMinutes: "15" };
@@ -251,25 +79,6 @@ describe("prepareRunConfig", () => {
       ]);
     });
 
-    test("should handle claudeArgs with legacy options", () => {
-      const options: ClaudeOptions = {
-        claudeArgs: "--max-turns 10",
-        allowedTools: "Bash,Read",
-      };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-
-      expect(prepared.claudeArgs).toEqual([
-        "-p",
-        "--max-turns",
-        "10",
-        "--allowedTools",
-        "Bash,Read",
-        "--verbose",
-        "--output-format",
-        "stream-json",
-      ]);
-    });
-
     test("should handle empty claudeArgs", () => {
       const options: ClaudeOptions = {
         claudeArgs: "",
@@ -300,70 +109,4 @@ describe("prepareRunConfig", () => {
       ]);
     });
   });
-
-  describe("custom environment variables", () => {
-    test("should parse empty claudeEnv correctly", () => {
-      const options: ClaudeOptions = { claudeEnv: "" };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({});
-    });
-
-    test("should parse single environment variable", () => {
-      const options: ClaudeOptions = { claudeEnv: "API_KEY: secret123" };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({ API_KEY: "secret123" });
-    });
-
-    test("should parse multiple environment variables", () => {
-      const options: ClaudeOptions = {
-        claudeEnv: "API_KEY: secret123\nDEBUG: true\nUSER: testuser",
-      };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({
-        API_KEY: "secret123",
-        DEBUG: "true",
-        USER: "testuser",
-      });
-    });
-
-    test("should handle environment variables with spaces around values", () => {
-      const options: ClaudeOptions = {
-        claudeEnv: "API_KEY:  secret123  \n  DEBUG  :  true  ",
-      };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({
-        API_KEY: "secret123",
-        DEBUG: "true",
-      });
-    });
-
-    test("should skip empty lines and comments", () => {
-      const options: ClaudeOptions = {
-        claudeEnv:
-          "API_KEY: secret123\n\n# This is a comment\nDEBUG: true\n# Another comment",
-      };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({
-        API_KEY: "secret123",
-        DEBUG: "true",
-      });
-    });
-
-    test("should skip lines without colons", () => {
-      const options: ClaudeOptions = {
-        claudeEnv: "API_KEY: secret123\nINVALID_LINE\nDEBUG: true",
-      };
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({
-        API_KEY: "secret123",
-        DEBUG: "true",
-      });
-    });
-
-    test("should handle undefined claudeEnv", () => {
-      const options: ClaudeOptions = {};
-      const prepared = prepareRunConfig("/tmp/test-prompt.txt", options);
-      expect(prepared.env).toEqual({});
-    });
-  });
 });