diff --git a/src/resources/extensions/sf/commands-handlers.js b/src/resources/extensions/sf/commands-handlers.js
index 11765370b..221a8f6ab 100644
--- a/src/resources/extensions/sf/commands-handlers.js
+++ b/src/resources/extensions/sf/commands-handlers.js
@@ -27,6 +27,7 @@ import {
 } from "./doctor.js";
 import { appendKnowledge, appendOverride } from "./files.js";
 import { sfRoot } from "./paths.js";
+import { sfHome } from "./sf-home.js";
 import { loadPrompt } from "./prompt-loader.js";
 import { deriveState } from "./state.js";
 
@@ -58,9 +59,7 @@ async function fetchLatestVersionForCommand() {
 export function dispatchDoctorHeal(pi, scope, reportText, structuredIssues) {
 	const workflowPath =
 		process.env.SF_WORKFLOW_PATH ??
-		join(process.env.HOME ?? "~", ".sf", "agent", "SF-WORKFLOW.md");
-	const workflow = readFileSync(workflowPath, "utf-8");
-	const prompt = loadPrompt("doctor-heal", {
+		join(sfHome(), "agent", "SF-WORKFLOW.md");
 		doctorSummary: reportText,
 		structuredIssues,
 		scopeLabel: scope ?? "active milestone / blocking scope",
@@ -410,7 +409,7 @@ export async function handleTriage(args, ctx, pi, basePath) {
 	});
 	const workflowPath =
 		process.env.SF_WORKFLOW_PATH ??
-		join(process.env.HOME ?? "~", ".sf", "agent", "SF-WORKFLOW.md");
+		join(sfHome(), "agent", "SF-WORKFLOW.md");
 	const workflow = readFileSync(workflowPath, "utf-8");
 	pi.sendMessage(
 		{
diff --git a/src/resources/extensions/sf/skills/directory.js b/src/resources/extensions/sf/skills/directory.js
index 959fa7cfb..dfeb5881e 100644
--- a/src/resources/extensions/sf/skills/directory.js
+++ b/src/resources/extensions/sf/skills/directory.js
@@ -9,12 +9,13 @@
 import { existsSync, readdirSync, readFileSync, statSync } from "node:fs";
 import { dirname, join } from "node:path";
 import { fileURLToPath } from "node:url";
+import { sfHome } from "../sf-home.js";
 
 const SKILL_FILENAME = "SKILL.md";
 
 export { SKILL_FILENAME };
 
-const USER_SKILL_DIR = join(process.env.HOME ?? "", ".sf", "skills");
+const USER_SKILL_DIR = join(sfHome(), "skills");
 
 export { USER_SKILL_DIR };
 
diff --git a/src/resources/extensions/sf/tools/tool-helpers.js b/src/resources/extensions/sf/tools/tool-helpers.js
index 2ae45a7aa..058c6077f 100644
--- a/src/resources/extensions/sf/tools/tool-helpers.js
+++ b/src/resources/extensions/sf/tools/tool-helpers.js
@@ -9,6 +9,7 @@
  */
 import { promises as fs, constants as fsConstants } from "node:fs";
 import { dirname } from "node:path";
+import { getErrorMessage } from "../error-utils.js";
 import { appendEvent } from "../workflow-events.js";
 import { logWarning } from "../workflow-logger.js";
 import { writeManifest } from "../workflow-manifest.js";
@@ -37,9 +38,7 @@ export async function ensureWritableParent(filePath) {
  *
  * Consumer: complete-task.js, complete-slice.js error formatting.
  */
-export function errorMessage(error) {
-	return error instanceof Error ? error.message : String(error);
-}
+export const errorMessage = getErrorMessage;
 
 /**
  * Run the standard post-mutation hook: project all projections, write the