Fall back to default on duplicate branch

Signed-off-by: Kevin Cui <bh@bugs.cc>

# Conflicts:
#	src/mcp/install-mcp-server.ts
#	src/modes/tag/index.ts
#	test/modes/agent.test.ts

.claude/settings.json

@@ -0,0 +1,15 @@
+{
+  "hooks": {
+    "PostToolUse": [
+      {
+        "hooks": [
+          {
+            "type": "command",
+            "command": "bun run format"
+          }
+        ],
+        "matcher": "Edit|Write|MultiEdit"
+      }
+    ]
+  }
+}

action.yml

@@ -23,6 +23,10 @@ inputs:
     description: "The prefix to use for Claude branches (defaults to 'claude/', use 'claude-' for dash format)"
     required: false
     default: "claude/"
+  branch_name_template:
+    description: "Template for branch naming. Available variables: {{prefix}}, {{entityType}}, {{entityNumber}}, {{timestamp}}, {{sha}}, {{label}}, {{description}}. {{label}} will be first label from the issue/PR, or {{entityType}} as a fallback. {{description}} will be the first 3 words of the issue/PR title in kebab-case. Default: '{{prefix}}{{entityType}}-{{entityNumber}}-{{timestamp}}'"
+    required: false
+    default: ""
   allowed_bots:
     description: "Comma-separated list of allowed bot usernames, or '*' to allow all bots. Empty string (default) allows no bots."
     required: false
@@ -150,6 +154,7 @@ runs:
         LABEL_TRIGGER: ${{ inputs.label_trigger }}
         BASE_BRANCH: ${{ inputs.base_branch }}
         BRANCH_PREFIX: ${{ inputs.branch_prefix }}
+        BRANCH_NAME_TEMPLATE: ${{ inputs.branch_name_template }}
         OVERRIDE_GITHUB_TOKEN: ${{ inputs.github_token }}
         ALLOWED_BOTS: ${{ inputs.allowed_bots }}
         ALLOWED_NON_WRITE_USERS: ${{ inputs.allowed_non_write_users }}
@@ -177,7 +182,7 @@ runs:
         # Install Claude Code if no custom executable is provided
         if [ -z "${{ inputs.path_to_claude_code_executable }}" ]; then
           echo "Installing Claude Code..."
-          curl -fsSL https://claude.ai/install.sh | bash -s 1.0.109
+          curl -fsSL https://claude.ai/install.sh | bash -s 1.0.113
           echo "$HOME/.local/bin" >> "$GITHUB_PATH"
         else
           echo "Using custom Claude Code executable: ${{ inputs.path_to_claude_code_executable }}"
@@ -223,6 +228,7 @@ runs:
         ANTHROPIC_API_KEY: ${{ inputs.anthropic_api_key }}
         CLAUDE_CODE_OAUTH_TOKEN: ${{ inputs.claude_code_oauth_token }}
         ANTHROPIC_BASE_URL: ${{ env.ANTHROPIC_BASE_URL }}
+        ANTHROPIC_CUSTOM_HEADERS: ${{ env.ANTHROPIC_CUSTOM_HEADERS }}
         CLAUDE_CODE_USE_BEDROCK: ${{ inputs.use_bedrock == 'true' && '1' || '' }}
         CLAUDE_CODE_USE_VERTEX: ${{ inputs.use_vertex == 'true' && '1' || '' }}
 

base-action/CLAUDE.md

@@ -50,7 +50,7 @@ This is a GitHub Action that allows running Claude Code within GitHub workflows.
 
 - Unit tests for configuration logic
 - Integration tests for prompt preparation
-- Full workflow tests in `.github/workflows/test-action.yml`
+- Full workflow tests in `.github/workflows/test-base-action.yml`
 
 ## Important Technical Details
 

base-action/action.yml

@@ -99,7 +99,7 @@ runs:
       run: |
         if [ -z "${{ inputs.path_to_claude_code_executable }}" ]; then
           echo "Installing Claude Code..."
-          curl -fsSL https://claude.ai/install.sh | bash -s 1.0.109
+          curl -fsSL https://claude.ai/install.sh | bash -s 1.0.113
         else
           echo "Using custom Claude Code executable: ${{ inputs.path_to_claude_code_executable }}"
           # Add the directory containing the custom executable to PATH
@@ -131,6 +131,7 @@ runs:
         ANTHROPIC_API_KEY: ${{ inputs.anthropic_api_key }}
         CLAUDE_CODE_OAUTH_TOKEN: ${{ inputs.claude_code_oauth_token }}
         ANTHROPIC_BASE_URL: ${{ env.ANTHROPIC_BASE_URL }}
+        ANTHROPIC_CUSTOM_HEADERS: ${{ env.ANTHROPIC_CUSTOM_HEADERS }}
         # Only set provider flags if explicitly true, since any value (including "false") is truthy
         CLAUDE_CODE_USE_BEDROCK: ${{ inputs.use_bedrock == 'true' && '1' || '' }}
         CLAUDE_CODE_USE_VERTEX: ${{ inputs.use_vertex == 'true' && '1' || '' }}

base-action/test-local.sh

@@ -9,4 +9,4 @@ fi
 # Run the test workflow locally
 # You'll need to provide your ANTHROPIC_API_KEY
 echo "Running action locally with act..."
-act push --secret ANTHROPIC_API_KEY="$ANTHROPIC_API_KEY" -W .github/workflows/test-action.yml --container-architecture linux/amd64
+act push --secret ANTHROPIC_API_KEY="$ANTHROPIC_API_KEY" -W .github/workflows/test-base-action.yml --container-architecture linux/amd64

docs/configuration.md

@@ -343,3 +343,31 @@ Many individual input parameters have been consolidated into `claude_args` or `s
 | `mcp_config`          | Use `claude_args: "--mcp-config '{...}'"`                |
 | `direct_prompt`       | Use `prompt` input instead                               |
 | `override_prompt`     | Use `prompt` with GitHub context variables               |
+
+## Custom Executables for Specialized Environments
+
+For specialized environments like Nix, custom container setups, or other package management systems where the default installation doesn't work, you can provide your own executables:
+
+### Custom Claude Code Executable
+
+Use `path_to_claude_code_executable` to provide your own Claude Code binary instead of using the automatically installed version:
+
+```yaml
+- uses: anthropics/claude-code-action@v1
+  with:
+    path_to_claude_code_executable: "/path/to/custom/claude"
+    # ... other inputs
+```
+
+### Custom Bun Executable
+
+Use `path_to_bun_executable` to provide your own Bun runtime instead of the default installation:
+
+```yaml
+- uses: anthropics/claude-code-action@v1
+  with:
+    path_to_bun_executable: "/path/to/custom/bun"
+    # ... other inputs
+```
+
+**Important**: Using incompatible versions may cause the action to fail. Ensure your custom executables are compatible with the action's requirements.

docs/faq.md

@@ -213,6 +213,44 @@ Check the GitHub Action log for Claude's run for the full execution trace.
 
 The trigger uses word boundaries, so `@claude` must be a complete word. Variations like `@claude-bot`, `@claude!`, or `claude@mention` won't work unless you customize the `trigger_phrase`.
 
+### How can I use custom executables in specialized environments?
+
+For specialized environments like Nix, NixOS, or custom container setups where you need to provide your own executables:
+
+**Using a custom Claude Code executable:**
+
+```yaml
+- uses: anthropics/claude-code-action@v1
+  with:
+    anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+    path_to_claude_code_executable: "/path/to/custom/claude"
+    # ... other inputs
+```
+
+**Using a custom Bun executable:**
+
+```yaml
+- uses: anthropics/claude-code-action@v1
+  with:
+    anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
+    path_to_bun_executable: "/path/to/custom/bun"
+    # ... other inputs
+```
+
+**Common use cases:**
+
+- Nix/NixOS environments where packages are managed differently
+- Docker containers with pre-installed executables
+- Custom build environments with specific version requirements
+- Debugging specific issues with particular versions
+
+**Important notes:**
+
+- Using an older Claude Code version may cause problems if the action uses newer features
+- Using an incompatible Bun version may cause runtime errors
+- The action will skip automatic installation when custom paths are provided
+- Ensure the custom executables are available in your GitHub Actions environment
+
 ## Best Practices
 
 1. **Always specify permissions explicitly** in your workflow file

docs/usage.md

@@ -48,7 +48,7 @@ jobs:
 ## Inputs
 
 | Input                            | Description                                                                                                                                                                    | Required | Default       |
-| ------------------------------ | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- | ------------- |
+| -------------------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ | -------- | ------------- |
 | `anthropic_api_key`              | Anthropic API key (required for direct API, not needed for Bedrock/Vertex)                                                                                                     | No\*     | -             |
 | `claude_code_oauth_token`        | Claude Code OAuth token (alternative to anthropic_api_key)                                                                                                                     | No\*     | -             |
 | `prompt`                         | Instructions for Claude. Can be a direct prompt or custom template for automation workflows                                                                                    | No       | -             |
@@ -72,6 +72,8 @@ jobs:
 | `bot_name`                       | GitHub username to use for git operations (defaults to Claude's bot name)                                                                                                      | No       | `claude[bot]` |
 | `allowed_bots`                   | Comma-separated list of allowed bot usernames, or '\*' to allow all bots. Empty string (default) allows no bots                                                                | No       | ""            |
 | `allowed_non_write_users`        | **⚠️ RISKY**: Comma-separated list of usernames to allow without write permissions, or '\*' for all users. Only works with `github_token` input. See [Security](./security.md) | No       | ""            |
+| `path_to_claude_code_executable` | Optional path to a custom Claude Code executable. Skips automatic installation. Useful for Nix, custom containers, or specialized environments                                 | No       | ""            |
+| `path_to_bun_executable`         | Optional path to a custom Bun executable. Skips automatic Bun installation. Useful for Nix, custom containers, or specialized environments                                     | No       | ""            |
 
 ### Deprecated Inputs
 

src/github/api/queries/github.ts

@@ -16,6 +16,11 @@ export const PR_QUERY = `
         additions
         deletions
         state
+        labels(first: 1) {
+          nodes {
+            name
+          }
+        }
         commits(first: 100) {
           totalCount
           nodes {
@@ -97,6 +102,11 @@ export const ISSUE_QUERY = `
         }
         createdAt
         state
+        labels(first: 1) {
+          nodes {
+            name
+          }
+        }
         comments(first: 100) {
           nodes {
             id

src/github/context.ts

@@ -88,6 +88,7 @@ type BaseContext = {
     labelTrigger: string;
     baseBranch?: string;
     branchPrefix: string;
+    branchNameTemplate?: string;
     useStickyComment: boolean;
     useCommitSigning: boolean;
     botId: string;
@@ -143,6 +144,7 @@ export function parseGitHubContext(): GitHubContext {
       labelTrigger: process.env.LABEL_TRIGGER ?? "",
       baseBranch: process.env.BASE_BRANCH,
       branchPrefix: process.env.BRANCH_PREFIX ?? "claude/",
+      branchNameTemplate: process.env.BRANCH_NAME_TEMPLATE,
       useStickyComment: process.env.USE_STICKY_COMMENT === "true",
       useCommitSigning: process.env.USE_COMMIT_SIGNING === "true",
       botId: process.env.BOT_ID ?? String(CLAUDE_APP_BOT_ID),

src/github/operations/branch.ts

@@ -12,6 +12,15 @@ import type { ParsedGitHubContext } from "../context";
 import type { GitHubPullRequest } from "../types";
 import type { Octokits } from "../api/client";
 import type { FetchDataResult } from "../data/fetcher";
+import { generateBranchName } from "../../utils/branch-template";
+
+/**
+ * Extracts the first label from GitHub data, or returns undefined if no labels exist
+ */
+function extractFirstLabel(githubData: FetchDataResult): string | undefined {
+  const labels = githubData.contextData.labels?.nodes;
+  return labels && labels.length > 0 ? labels[0]?.name : undefined;
+}
 
 export type BranchInfo = {
   baseBranch: string;
@@ -26,7 +35,7 @@ export async function setupBranch(
 ): Promise<BranchInfo> {
   const { owner, repo } = context.repository;
   const entityNumber = context.entityNumber;
-  const { baseBranch, branchPrefix } = context.inputs;
+  const { baseBranch, branchPrefix, branchNameTemplate } = context.inputs;
   const isPR = context.isPR;
 
   if (isPR) {
@@ -87,17 +96,8 @@ export async function setupBranch(
   // Generate branch name for either an issue or closed/merged PR
   const entityType = isPR ? "pr" : "issue";
 
-  // Create Kubernetes-compatible timestamp: lowercase, hyphens only, shorter format
+  // Get the SHA of the source branch to use in template
-  const now = new Date();
+  let sourceSHA: string | undefined;
-  const timestamp = `${now.getFullYear()}${String(now.getMonth() + 1).padStart(2, "0")}${String(now.getDate()).padStart(2, "0")}-${String(now.getHours()).padStart(2, "0")}${String(now.getMinutes()).padStart(2, "0")}`;
-
-  // Ensure branch name is Kubernetes-compatible:
-  // - Lowercase only
-  // - Alphanumeric with hyphens
-  // - No underscores
-  // - Max 50 chars (to allow for prefixes)
-  const branchName = `${branchPrefix}${entityType}-${entityNumber}-${timestamp}`;
-  const newBranch = branchName.toLowerCase().substring(0, 50);
 
   try {
     // Get the SHA of the source branch to verify it exists
@@ -107,8 +107,46 @@ export async function setupBranch(
       ref: `heads/${sourceBranch}`,
     });
 
-    const currentSHA = sourceBranchRef.data.object.sha;
+    sourceSHA = sourceBranchRef.data.object.sha;
-    console.log(`Source branch SHA: ${currentSHA}`);
+    console.log(`Source branch SHA: ${sourceSHA}`);
+
+    // Extract first label from GitHub data
+    const firstLabel = extractFirstLabel(githubData);
+
+    // Extract title from GitHub data
+    const title = githubData.contextData.title;
+
+    // Generate branch name using template or default format
+    let newBranch = generateBranchName(
+      branchNameTemplate,
+      branchPrefix,
+      entityType,
+      entityNumber,
+      sourceSHA,
+      firstLabel,
+      title,
+    );
+
+    // Check if generated branch already exists on remote
+    try {
+      await $`git ls-remote --exit-code origin refs/heads/${newBranch}`.quiet();
+
+      // If we get here, branch exists (exit code 0)
+      console.log(
+        `Branch '${newBranch}' already exists, falling back to default format`,
+      );
+      newBranch = generateBranchName(
+        undefined, // Force default template
+        branchPrefix,
+        entityType,
+        entityNumber,
+        sourceSHA,
+        firstLabel,
+        title,
+      );
+    } catch {
+      // Branch doesn't exist (non-zero exit code), continue with generated name
+    }
 
     // For commit signing, defer branch creation to the file ops server
     if (context.inputs.useCommitSigning) {

src/github/types.ts

@@ -61,6 +61,11 @@ export type GitHubPullRequest = {
   additions: number;
   deletions: number;
   state: string;
+  labels: {
+    nodes: Array<{
+      name: string;
+    }>;
+  };
   commits: {
     totalCount: number;
     nodes: Array<{
@@ -84,6 +89,11 @@ export type GitHubIssue = {
   author: GitHubAuthor;
   createdAt: string;
   state: string;
+  labels: {
+    nodes: Array<{
+      name: string;
+    }>;
+  };
   comments: {
     nodes: GitHubComment[];
   };

src/mcp/install-mcp-server.ts

@@ -3,6 +3,7 @@ import { GITHUB_API_URL, GITHUB_SERVER_URL } from "../github/api/config";
 import type { GitHubContext } from "../github/context";
 import { isEntityContext } from "../github/context";
 import { Octokit } from "@octokit/rest";
+import type { AutoDetectedMode } from "../modes/detector";
 
 type PrepareConfigParams = {
   githubToken: string;
@@ -12,8 +13,8 @@ type PrepareConfigParams = {
   baseBranch: string;
   claudeCommentId?: string;
   allowedTools: string[];
+  mode: AutoDetectedMode;
   context: GitHubContext;
-  mode: "tag" | "agent";
 };
 
 async function checkActionsReadPermission(
@@ -65,8 +66,13 @@ export async function prepareMcpConfig(
   try {
     const allowedToolsList = allowedTools || [];
 
+    // Detect if we're in agent mode (explicit prompt provided)
     const isAgentMode = mode === "agent";
 
+    const hasGitHubCommentTools = allowedToolsList.some((tool) =>
+      tool.startsWith("mcp__github_comment__"),
+    );
+
     const hasGitHubMcpTools = allowedToolsList.some((tool) =>
       tool.startsWith("mcp__github__"),
     );
@@ -86,7 +92,7 @@ export async function prepareMcpConfig(
     // Include comment server:
     // - Always in tag mode (for updating Claude comments)
     // - Only with explicit tools in agent mode
-    const shouldIncludeCommentServer = !isAgentMode;
+    const shouldIncludeCommentServer = !isAgentMode || hasGitHubCommentTools;
 
     if (shouldIncludeCommentServer) {
       baseMcpConfig.mcpServers.github_comment = {

src/modes/agent/index.ts

@@ -135,8 +135,8 @@ export const agentMode: Mode = {
       baseBranch: baseBranch,
       claudeCommentId: undefined, // No tracking comment in agent mode
       allowedTools,
-      context,
       mode: "agent",
+      context,
     });
 
     // Build final claude_args with multiple --mcp-config flags

src/modes/tag/index.ts

@@ -14,6 +14,7 @@ import { createPrompt, generateDefaultPrompt } from "../../create-prompt";
 import { isEntityContext } from "../../github/context";
 import type { PreparedContext } from "../../create-prompt/types";
 import type { FetchDataResult } from "../../github/data/fetcher";
+import { parseAllowedTools } from "../agent/parse-tools";
 
 /**
  * Tag mode implementation.
@@ -112,20 +113,10 @@ export const tagMode: Mode = {
 
     await createPrompt(tagMode, modeContext, githubData, context);
 
-    // Get our GitHub MCP servers configuration
+    const userClaudeArgs = process.env.CLAUDE_ARGS || "";
-    const ourMcpConfig = await prepareMcpConfig({
+    const userAllowedMCPTools = parseAllowedTools(userClaudeArgs).filter(
-      githubToken,
+      (tool) => tool.startsWith("mcp__github_"),
-      owner: context.repository.owner,
+    );
-      repo: context.repository.repo,
-      branch: branchInfo.claudeBranch || branchInfo.currentBranch,
-      baseBranch: branchInfo.baseBranch,
-      claudeCommentId: commentId.toString(),
-      allowedTools: [],
-      context,
-      mode: "tag",
-    });
-
-    // Don't output mcp_config separately anymore - include in claude_args
 
     // Build claude_args for tag mode with required tools
     // Tag mode REQUIRES these tools to function properly
@@ -141,6 +132,7 @@ export const tagMode: Mode = {
       "mcp__github_ci__get_ci_status",
       "mcp__github_ci__get_workflow_run_details",
       "mcp__github_ci__download_job_log",
+      ...userAllowedMCPTools,
     ];
 
     // Add git commands when not using commit signing
@@ -162,7 +154,18 @@ export const tagMode: Mode = {
       );
     }
 
-    const userClaudeArgs = process.env.CLAUDE_ARGS || "";
+    // Get our GitHub MCP servers configuration
+    const ourMcpConfig = await prepareMcpConfig({
+      githubToken,
+      owner: context.repository.owner,
+      repo: context.repository.repo,
+      branch: branchInfo.claudeBranch || branchInfo.currentBranch,
+      baseBranch: branchInfo.baseBranch,
+      claudeCommentId: commentId.toString(),
+      allowedTools: Array.from(new Set(tagModeTools)),
+      mode: "tag",
+      context,
+    });
 
     // Build complete claude_args with multiple --mcp-config flags
     let claudeArgs = "";

src/utils/branch-template.ts

@@ -0,0 +1,94 @@
+#!/usr/bin/env bun
+
+/**
+ * Branch name template parsing and variable substitution utilities
+ */
+
+/**
+ * Extracts the first three words from a title and converts them to kebab-case
+ */
+function extractDescription(title: string): string {
+  if (!title || title.trim() === "") {
+    return "";
+  }
+
+  return title
+    .trim() // Remove leading/trailing whitespace
+    .split(/\s+/) // Split on whitespace
+    .slice(0, 3) // Take first 3 words
+    .join("-") // Join with hyphens
+    .toLowerCase() // Convert to lowercase
+    .replace(/[^a-z0-9-]/g, "") // Remove non-alphanumeric except hyphens
+    .replace(/-+/g, "-") // Replace multiple hyphens with single
+    .replace(/^-|-$/g, ""); // Remove leading/trailing hyphens
+}
+
+export interface BranchTemplateVariables {
+  prefix: string;
+  entityType: string;
+  entityNumber: number;
+  timestamp: string;
+  sha?: string;
+  label?: string;
+  description?: string;
+}
+
+/**
+ * Replaces template variables in a branch name template
+ * Template format: {{variableName}}
+ */
+export function applyBranchTemplate(
+  template: string,
+  variables: BranchTemplateVariables,
+): string {
+  let result = template;
+
+  // Replace each variable
+  Object.entries(variables).forEach(([key, value]) => {
+    const placeholder = `{{${key}}}`;
+    const replacement = value ? String(value) : "";
+    result = result.replaceAll(placeholder, replacement);
+  });
+
+  return result;
+}
+
+/**
+ * Generates a branch name from the provided `template` and set of `variables`. Uses a default format if the template is empty or produces an empty result.
+ */
+export function generateBranchName(
+  template: string | undefined,
+  branchPrefix: string,
+  entityType: string,
+  entityNumber: number,
+  sha?: string,
+  label?: string,
+  title?: string,
+): string {
+  const now = new Date();
+
+  const variables: BranchTemplateVariables = {
+    prefix: branchPrefix,
+    entityType,
+    entityNumber,
+    timestamp: `${now.getFullYear()}${String(now.getMonth() + 1).padStart(2, "0")}${String(now.getDate()).padStart(2, "0")}-${String(now.getHours()).padStart(2, "0")}${String(now.getMinutes()).padStart(2, "0")}`,
+    sha: sha?.substring(0, 8), // First 8 characters of SHA
+    label: label || entityType, // Fall back to entityType if no label
+    description: title ? extractDescription(title) : undefined,
+  };
+
+  if (template?.trim()) {
+    const branchName = applyBranchTemplate(template, variables);
+
+    // Some templates could produce empty results- validate
+    if (branchName.trim().length > 0) return branchName;
+
+    console.log(
+      `Branch template '${template}' generated empty result, falling back to default format`,
+    );
+  }
+
+  const branchName = `${branchPrefix}${entityType}-${entityNumber}-${variables.timestamp}`;
+  // Kubernetes compatible: lowercase, max 50 chars, alphanumeric and hyphens only
+  return branchName.toLowerCase().substring(0, 50);
+}

test/branch-template.test.ts

@@ -0,0 +1,232 @@
+#!/usr/bin/env bun
+
+import { describe, it, expect } from "bun:test";
+import {
+  applyBranchTemplate,
+  generateBranchName,
+} from "../src/utils/branch-template";
+
+describe("branch template utilities", () => {
+  describe("applyBranchTemplate", () => {
+    it("should replace all template variables", () => {
+      const template =
+        "{{prefix}}{{entityType}}-{{entityNumber}}-{{timestamp}}";
+      const variables = {
+        prefix: "feat/",
+        entityType: "issue",
+        entityNumber: 123,
+        timestamp: "20240301-1430",
+        sha: "abcd1234",
+      };
+
+      const result = applyBranchTemplate(template, variables);
+      expect(result).toBe("feat/issue-123-20240301-1430");
+    });
+
+    it("should handle custom templates with multiple variables", () => {
+      const template =
+        "{{prefix}}fix/{{entityType}}_{{entityNumber}}_{{timestamp}}_{{sha}}";
+      const variables = {
+        prefix: "claude-",
+        entityType: "pr",
+        entityNumber: 456,
+        timestamp: "20240301-1430",
+        sha: "abcd1234",
+      };
+
+      const result = applyBranchTemplate(template, variables);
+      expect(result).toBe("claude-fix/pr_456_20240301-1430_abcd1234");
+    });
+
+    it("should handle templates with missing variables gracefully", () => {
+      const template = "{{prefix}}{{entityType}}-{{missing}}-{{entityNumber}}";
+      const variables = {
+        prefix: "feat/",
+        entityType: "issue",
+        entityNumber: 123,
+        timestamp: "20240301-1430",
+      };
+
+      const result = applyBranchTemplate(template, variables);
+      expect(result).toBe("feat/issue-{{missing}}-123");
+    });
+  });
+
+  describe("generateBranchName", () => {
+    it("should use custom template when provided", () => {
+      const template = "{{prefix}}custom-{{entityType}}_{{entityNumber}}";
+      const result = generateBranchName(template, "feature/", "issue", 123);
+
+      expect(result).toBe("feature/custom-issue_123");
+    });
+
+    it("should use default format when template is empty", () => {
+      const result = generateBranchName("", "claude/", "issue", 123);
+
+      expect(result).toMatch(/^claude\/issue-123-\d{8}-\d{4}$/);
+    });
+
+    it("should use default format when template is undefined", () => {
+      const result = generateBranchName(undefined, "claude/", "pr", 456);
+
+      expect(result).toMatch(/^claude\/pr-456-\d{8}-\d{4}$/);
+    });
+
+    it("should preserve custom template formatting (no automatic lowercase/truncation)", () => {
+      const template = "{{prefix}}UPPERCASE_Branch-Name_{{entityNumber}}";
+      const result = generateBranchName(template, "Feature/", "issue", 123);
+
+      expect(result).toBe("Feature/UPPERCASE_Branch-Name_123");
+    });
+
+    it("should not truncate custom template results", () => {
+      const template =
+        "{{prefix}}very-long-branch-name-that-exceeds-the-maximum-allowed-length-{{entityNumber}}";
+      const result = generateBranchName(template, "feature/", "issue", 123);
+
+      expect(result).toBe(
+        "feature/very-long-branch-name-that-exceeds-the-maximum-allowed-length-123",
+      );
+    });
+
+    it("should apply Kubernetes-compatible transformations to default template only", () => {
+      const result = generateBranchName(undefined, "Feature/", "issue", 123);
+
+      expect(result).toMatch(/^feature\/issue-123-\d{8}-\d{4}$/);
+      expect(result.length).toBeLessThanOrEqual(50);
+    });
+
+    it("should handle SHA in template", () => {
+      const template = "{{prefix}}{{entityType}}-{{entityNumber}}-{{sha}}";
+      const result = generateBranchName(
+        template,
+        "fix/",
+        "pr",
+        789,
+        "abcdef123456",
+      );
+
+      expect(result).toBe("fix/pr-789-abcdef12");
+    });
+
+    it("should use label in template when provided", () => {
+      const template = "{{prefix}}{{label}}/{{entityNumber}}";
+      const result = generateBranchName(
+        template,
+        "feature/",
+        "issue",
+        123,
+        undefined,
+        "bug",
+      );
+
+      expect(result).toBe("feature/bug/123");
+    });
+
+    it("should fallback to entityType when label template is used but no label provided", () => {
+      const template = "{{prefix}}{{label}}-{{entityNumber}}";
+      const result = generateBranchName(template, "fix/", "pr", 456);
+
+      expect(result).toBe("fix/pr-456");
+    });
+
+    it("should handle template with both label and entityType", () => {
+      const template = "{{prefix}}{{label}}-{{entityType}}_{{entityNumber}}";
+      const result = generateBranchName(
+        template,
+        "dev/",
+        "issue",
+        789,
+        undefined,
+        "enhancement",
+      );
+
+      expect(result).toBe("dev/enhancement-issue_789");
+    });
+
+    it("should use description in template when provided", () => {
+      const template = "{{prefix}}{{description}}/{{entityNumber}}";
+      const result = generateBranchName(
+        template,
+        "feature/",
+        "issue",
+        123,
+        undefined,
+        undefined,
+        "Fix login bug with OAuth",
+      );
+
+      expect(result).toBe("feature/fix-login-bug/123");
+    });
+
+    it("should handle template with multiple variables including description", () => {
+      const template =
+        "{{prefix}}{{label}}/{{description}}-{{entityType}}_{{entityNumber}}";
+      const result = generateBranchName(
+        template,
+        "dev/",
+        "issue",
+        456,
+        undefined,
+        "bug",
+        "User authentication fails completely",
+      );
+
+      expect(result).toBe("dev/bug/user-authentication-fails-issue_456");
+    });
+
+    it("should handle description with special characters in template", () => {
+      const template = "{{prefix}}{{description}}-{{entityNumber}}";
+      const result = generateBranchName(
+        template,
+        "fix/",
+        "pr",
+        789,
+        undefined,
+        undefined,
+        "Add: User Registration & Email Validation",
+      );
+
+      expect(result).toBe("fix/add-user-registration-789");
+    });
+
+    it("should handle empty description in template", () => {
+      const template = "{{prefix}}{{description}}-{{entityNumber}}";
+      const result = generateBranchName(
+        template,
+        "test/",
+        "issue",
+        101,
+        undefined,
+        undefined,
+        "",
+      );
+
+      expect(result).toBe("test/-101");
+    });
+
+    it("should fallback to default format when template produces empty result", () => {
+      const template = "{{description}}"; // Will be empty if no title provided
+      const result = generateBranchName(template, "claude/", "issue", 123);
+
+      expect(result).toMatch(/^claude\/issue-123-\d{8}-\d{4}$/);
+      expect(result.length).toBeLessThanOrEqual(50);
+    });
+
+    it("should fallback to default format when template produces only whitespace", () => {
+      const template = "  {{description}}  "; // Will be "  " if description is empty
+      const result = generateBranchName(
+        template,
+        "fix/",
+        "pr",
+        456,
+        undefined,
+        undefined,
+        "",
+      );
+
+      expect(result).toMatch(/^fix\/pr-456-\d{8}-\d{4}$/);
+      expect(result.length).toBeLessThanOrEqual(50);
+    });
+  });
+});

test/create-prompt.test.ts

@@ -61,6 +61,7 @@ describe("generatePrompt", () => {
       body: "This is a test PR",
       author: { login: "testuser" },
       state: "OPEN",
+      labels: { nodes: [] },
       createdAt: "2023-01-01T00:00:00Z",
       additions: 15,
       deletions: 5,
@@ -475,6 +476,7 @@ describe("generatePrompt", () => {
         body: "The login form is not working",
         author: { login: "testuser" },
         state: "OPEN",
+        labels: { nodes: [] },
         createdAt: "2023-01-01T00:00:00Z",
         comments: {
           nodes: [],

test/data-formatter.test.ts

@@ -28,6 +28,9 @@ describe("formatContext", () => {
       additions: 50,
       deletions: 30,
       state: "OPEN",
+      labels: {
+        nodes: [],
+      },
       commits: {
         totalCount: 3,
         nodes: [],
@@ -63,6 +66,9 @@ Changed Files: 2 files`,
       author: { login: "test-user" },
       createdAt: "2023-01-01T00:00:00Z",
       state: "OPEN",
+      labels: {
+        nodes: [],
+      },
       comments: {
         nodes: [],
       },

test/install-mcp-server.test.ts

@@ -106,8 +106,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockContextWithSigning,
       mode: "tag",
+      context: mockContextWithSigning,
     });
 
     const parsed = JSON.parse(result);
@@ -130,8 +130,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: ["mcp__github__create_issue", "mcp__github__create_pr"],
-      context: mockContext,
       mode: "tag",
+      context: mockContext,
     });
 
     const parsed = JSON.parse(result);
@@ -151,8 +151,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: ["mcp__github_inline_comment__create_inline_comment"],
-      context: mockPRContext,
       mode: "tag",
+      context: mockPRContext,
     });
 
     const parsed = JSON.parse(result);
@@ -172,8 +172,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockContext,
       mode: "tag",
+      context: mockContext,
     });
 
     const parsed = JSON.parse(result);
@@ -193,8 +193,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockContextWithSigning,
       mode: "tag",
+      context: mockContextWithSigning,
     });
 
     const parsed = JSON.parse(result);
@@ -213,8 +213,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockContextWithSigning,
       mode: "tag",
+      context: mockContextWithSigning,
     });
 
     const parsed = JSON.parse(result);
@@ -231,8 +231,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockPRContext,
       mode: "tag",
+      context: mockPRContext,
     });
 
     const parsed = JSON.parse(result);
@@ -251,8 +251,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockContext,
       mode: "tag",
+      context: mockContext,
     });
 
     const parsed = JSON.parse(result);
@@ -269,8 +269,8 @@ describe("prepareMcpConfig", () => {
       branch: "test-branch",
       baseBranch: "main",
       allowedTools: [],
-      context: mockPRContext,
       mode: "tag",
+      context: mockPRContext,
     });
 
     const parsed = JSON.parse(result);

test/modes/detector.test.ts

@@ -20,7 +20,10 @@ describe("detectMode with enhanced routing", () => {
       branchPrefix: "claude/",
       useStickyComment: false,
       useCommitSigning: false,
+      botId: "123456",
+      botName: "claude-bot",
       allowedBots: "",
+      allowedNonWriteUsers: "",
       trackProgress: false,
     },
   };