feat(git-master): add git_env_prefix config to prefix all git commands

When git-master skill is loaded, all git commands are prefixed with the configured env variable (default: GIT_MASTER=1). This enables custom git hooks to detect git-master skill usage. Set to empty string to disable.

src/config/schema/git-master.ts

@@ -5,6 +5,8 @@ export const GitMasterConfigSchema = z.object({
   commit_footer: z.union([z.boolean(), z.string()]).default(true),
   /** Add "Co-authored-by: Sisyphus" trailer to commit messages (default: true) */
   include_co_authored_by: z.boolean().default(true),
+  /** Environment variable prefix for all git commands (default: "GIT_MASTER=1"). Set to "" to disable. Allows custom git hooks to detect git-master skill usage. */
+  git_env_prefix: z.string().default("GIT_MASTER=1"),
 })
 
 export type GitMasterConfig = z.infer<typeof GitMasterConfigSchema>

src/features/opencode-skill-loader/git-master-template-injection.ts

@@ -3,12 +3,73 @@ import type { GitMasterConfig } from "../../config/schema"
 export function injectGitMasterConfig(template: string, config?: GitMasterConfig): string {
 	const commitFooter = config?.commit_footer ?? true
 	const includeCoAuthoredBy = config?.include_co_authored_by ?? true
+	const gitEnvPrefix = config?.git_env_prefix ?? "GIT_MASTER=1"
+
+	let result = gitEnvPrefix ? injectGitEnvPrefix(template, gitEnvPrefix) : template
 
 	if (!commitFooter && !includeCoAuthoredBy) {
-		return template
+		return result
 	}
 
+	const injection = buildCommitFooterInjection(commitFooter, includeCoAuthoredBy, gitEnvPrefix)
+
+	const insertionPoint = result.indexOf("```\n</execution>")
+	if (insertionPoint !== -1) {
+		return (
+			result.slice(0, insertionPoint) +
+			"```\n\n" +
+			injection +
+			"\n</execution>" +
+			result.slice(insertionPoint + "```\n</execution>".length)
+		)
+	}
+
+	return result + "\n\n" + injection
+}
+
+function injectGitEnvPrefix(template: string, prefix: string): string {
+	const envPrefixSection = [
+		"## GIT COMMAND PREFIX (MANDATORY)",
+		"",
+		`<git_env_prefix>`,
+		`**EVERY git command MUST be prefixed with \`${prefix}\`.**`,
+		"",
+		"This allows custom git hooks to detect when git-master skill is active.",
+		"",
+		"```bash",
+		`${prefix} git status`,
+		`${prefix} git add <files>`,
+		`${prefix} git commit -m "message"`,
+		`${prefix} git push`,
+		`${prefix} git rebase ...`,
+		`${prefix} git log ...`,
+		"```",
+		"",
+		"**NO EXCEPTIONS. Every `git` invocation must include this prefix.**",
+		`</git_env_prefix>`,
+	].join("\n")
+
+	const modeDetectionMarker = "## MODE DETECTION (FIRST STEP)"
+	const markerIndex = template.indexOf(modeDetectionMarker)
+	if (markerIndex !== -1) {
+		return (
+			template.slice(0, markerIndex) +
+			envPrefixSection +
+			"\n\n---\n\n" +
+			template.slice(markerIndex)
+		)
+	}
+
+	return envPrefixSection + "\n\n---\n\n" + template
+}
+
+function buildCommitFooterInjection(
+	commitFooter: boolean | string,
+	includeCoAuthoredBy: boolean,
+	gitEnvPrefix: string,
+): string {
 	const sections: string[] = []
+	const cmdPrefix = gitEnvPrefix ? `${gitEnvPrefix} ` : ""
 
 	sections.push("### 5.5 Commit Footer & Co-Author")
 	sections.push("")
@@ -43,7 +104,7 @@ export function injectGitMasterConfig(template: string, config?: GitMasterConfig
 		sections.push("**Example (both enabled):**")
 		sections.push("```bash")
 		sections.push(
-			`git commit -m "{Commit Message}" -m "${footerText}" -m "Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>"`
+			`${cmdPrefix}git commit -m "{Commit Message}" -m "${footerText}" -m "Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>"`
 		)
 		sections.push("```")
 	} else if (commitFooter) {
@@ -53,29 +114,16 @@ export function injectGitMasterConfig(template: string, config?: GitMasterConfig
 				: "Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)"
 		sections.push("**Example:**")
 		sections.push("```bash")
-		sections.push(`git commit -m "{Commit Message}" -m "${footerText}"`)
+		sections.push(`${cmdPrefix}git commit -m "{Commit Message}" -m "${footerText}"`)
 		sections.push("```")
 	} else if (includeCoAuthoredBy) {
 		sections.push("**Example:**")
 		sections.push("```bash")
 		sections.push(
-			"git commit -m \"{Commit Message}\" -m \"Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>\""
+			`${cmdPrefix}git commit -m "{Commit Message}" -m "Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>"`
 		)
 		sections.push("```")
 	}
 
-	const injection = sections.join("\n")
+	return sections.join("\n")
-
-	const insertionPoint = template.indexOf("```\n</execution>")
-	if (insertionPoint !== -1) {
-		return (
-			template.slice(0, insertionPoint) +
-			"```\n\n" +
-			injection +
-			"\n</execution>" +
-			template.slice(insertionPoint + "```\n</execution>".length)
-		)
-	}
-
-	return template + "\n\n" + injection
 }