diff --git a/.changeset/add-prompt-editor-settings.md b/.changeset/add-prompt-editor-settings.md
new file mode 100644
index 000000000..e9e5644f1
--- /dev/null
+++ b/.changeset/add-prompt-editor-settings.md
@@ -0,0 +1,5 @@
+---
+"@gsxdsm/fusion": patch
+---
+
+Add Prompts section to Settings modal for fine-grained prompt customization. Users can now discover and edit AI agent prompt segments through a visual editor in the dashboard. The Prompts section (Settings → Prompts) displays all available prompt keys with their descriptions, provides textareas for editing overrides, and includes Reset buttons to restore built-in defaults. Cleared overrides are persisted as `null` to delete the override and fall back to defaults.
diff --git a/README.md b/README.md
index 85282597e..bbead1e2c 100644
--- a/README.md
+++ b/README.md
@@ -392,6 +392,18 @@ Built-in prompt templates are available for common roles:
 
 Assign templates per role with the `agentPrompts` project setting, and add custom templates for team-specific behavior. You can also set per-agent custom instructions in the dashboard.
 
+### Fine-Grained Prompt Overrides
+
+The **Prompts** section in the Settings modal (dashboard) allows you to customize specific segments of AI agent prompts without replacing entire role templates. This enables surgical customization of prompt sections like:
+
+- Executor welcome, guardrails, spawning instructions, completion criteria
+- Triage welcome and context
+- Reviewer verdict criteria
+- Merger conflict resolution instructions
+- Agent generation and workflow step prompts
+
+Each prompt shows its built-in description, allows text editing, and provides a Reset button to restore the default. Overrides are stored in the project settings and fall back to built-in defaults when cleared.
+
 ### Agent Controls (CLI)
 
 ```bash
@@ -661,6 +673,7 @@ Project settings override global settings. Configure in the dashboard under **Se
 | `recycleWorktrees` | Project | false | Pool and reuse worktrees for efficiency |
 | `groupOverlappingFiles` | Project | false | Serialize tasks with shared file scopes |
 | `agentPrompts` | Project | - | Role-based prompt templates and assignments |
+| `promptOverrides` | Project | - | Fine-grained prompt segment overrides |
 | `autoSummarizeTitles` | Project | false | Auto-generate titles for untitled tasks |
 | `autoBackupEnabled` | Project | false | Enable automatic database backups |
 | `autoBackupSchedule` | Project | `0 2 * * *` | Cron expression for backup schedule |
diff --git a/docs/agents.md b/docs/agents.md
index 2d50fa505..64c9ad23d 100644
--- a/docs/agents.md
+++ b/docs/agents.md
@@ -162,6 +162,42 @@ This separation means:
 
 When no assignment is configured, Fusion falls back to built-in defaults.
 
+## Fine-Grained Prompt Overrides (`promptOverrides`)
+
+The **Prompts** section in the Settings modal provides a user-friendly interface for customizing specific segments of agent prompts. Unlike `agentPrompts` which replaces entire role templates, `promptOverrides` allows surgical customization of individual prompt sections.
+
+### Supported Override Keys
+
+| Key | Agent Role | Description |
+|-----|-----------|-------------|
+| `executor-welcome` | executor | Introductory section for the executor agent |
+| `executor-guardrails` | executor | Behavioral guardrails and constraints |
+| `executor-spawning` | executor | Instructions for spawning child agents |
+| `executor-completion` | executor | Completion criteria and signaling |
+| `triage-welcome` | triage | Introductory section for the triage/specification agent |
+| `triage-context` | triage | Context-gathering instructions |
+| `reviewer-verdict` | reviewer | Verdict criteria and format |
+| `merger-conflicts` | merger | Merge conflict resolution instructions |
+| `agent-generation-system` | — | System prompt for AI-assisted agent specification generation |
+| `workflow-step-refine` | — | System prompt for refining workflow step descriptions |
+
+### How It Works
+
+1. Navigate to **Settings → Prompts** in the dashboard
+2. Each prompt shows its name, key, description, and current value
+3. Edit the textarea to create a custom override
+4. Click **Reset** to restore the built-in default
+
+### Clearing Overrides
+
+To clear a specific override, click the **Reset** button in the UI. This sends `null` for that prompt key, deleting the override from settings and reverting to the built-in default.
+
+### Relationship with `agentPrompts`
+
+- `agentPrompts` replaces entire role templates
+- `promptOverrides` customizes individual segments within any template
+- Both can be used together — `promptOverrides` applies to the segment even within a custom role template
+
 ## Inter-Agent Messaging
 
 Messaging is available in dashboard mailbox UI and CLI.