diff --git a/src/ClaudeDo.Data/PromptFiles.cs b/src/ClaudeDo.Data/PromptFiles.cs
index 060bb1f..e546534 100644
--- a/src/ClaudeDo.Data/PromptFiles.cs
+++ b/src/ClaudeDo.Data/PromptFiles.cs
@@ -2,7 +2,7 @@ using System.Text;
 
 namespace ClaudeDo.Data;
 
-public enum PromptKind { System, Planning, PlanningInitial, Retry, DailyPrep, WeeklyReport, ImprovementChild }
+public enum PromptKind { System, Planning, PlanningInitial, Retry, DailyPrep, WeeklyReport, ImprovementChild, Refine }
 
 public static class PromptFiles
 {
@@ -17,6 +17,7 @@ public static class PromptFiles
         PromptKind.DailyPrep => Path.Combine(Root, "daily-prep.md"),
         PromptKind.WeeklyReport => Path.Combine(Root, "weekly-report.md"),
         PromptKind.ImprovementChild => Path.Combine(Root, "improvement-child.md"),
+        PromptKind.Refine => Path.Combine(Root, "refine.md"),
         _ => throw new ArgumentOutOfRangeException(nameof(kind))
     };
 
@@ -61,6 +62,7 @@ public static class PromptFiles
         PromptKind.DailyPrep => DailyPrepDefault,
         PromptKind.WeeklyReport => WeeklyReportDefault,
         PromptKind.ImprovementChild => ImprovementChildDefault,
+        PromptKind.Refine => RefineDefault,
         _ => ""
     };
 
@@ -181,6 +183,33 @@ public static class PromptFiles
         If there are no candidates, do nothing.
         """;
 
+    private const string RefineDefault = """
+        You are refining ONE ClaudeDo task so it is ready to run autonomously later.
+        You are NOT executing the task — only improving its specification.
+
+        The task you are refining:
+        - id: {taskId}
+        - title: {title}
+        - description: {description}
+        - current subtasks (steps):
+        {subtasks}
+
+        What to do:
+        1. If a repository is available, read the relevant code (read-only) to ground your
+           understanding. Do NOT edit, create, or delete any files. Do NOT run commands.
+        2. Rewrite the description so it is clear, specific, and self-contained: what to change,
+           where, and what "done" looks like. Keep scope tight — do not invent adjacent work.
+        3. Call mcp__claudedo__update_task to save the improved title (only if it genuinely
+           helps) and description.
+        4. If the work is clearer as discrete steps, add them as subtasks with
+           mcp__claudedo__add_subtask (one call per step, in order). Only add steps that are
+           not already present in the current subtasks above.
+
+        Use ONLY these tools: mcp__claudedo__get_task, mcp__claudedo__update_task,
+        mcp__claudedo__add_subtask, and read-only Read/Grep/Glob. When you have updated the
+        task, stop.
+        """;
+
     private const string WeeklyReportDefault = """
         You are generating a concise weekly standup report for a software developer,
         covering {start} to {end}.