diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 7136b79bd03..193de7f5c23 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -2,6 +2,14 @@
 
 ## [Unreleased]
 
+### Added
+
+- Exported `convertToPng` for extension authors.
+
+### Changed
+
+- Changed `pi.getAllTools()` to return full readonly tool definitions with source metadata.
+
 ## [0.76.0] - 2026-05-27
 
 ### New Features
diff --git a/packages/coding-agent/docs/extensions.md b/packages/coding-agent/docs/extensions.md
index ce922f2aeaf..40f54cd6f6f 100644
--- a/packages/coding-agent/docs/extensions.md
+++ b/packages/coding-agent/docs/extensions.md
@@ -139,7 +139,7 @@ To share extensions via npm or git as pi packages, see [packages.md](packages.md
 
 | Package | Purpose |
 |---------|---------|
-| `@earendil-works/pi-coding-agent` | Extension types (`ExtensionAPI`, `ExtensionContext`, events) |
+| `@earendil-works/pi-coding-agent` | Extension types (`ExtensionAPI`, `ExtensionContext`, events) and utilities (`convertToPng`, `resizeImage`) |
 | `typebox` | Schema definitions for tool parameters |
 | `@earendil-works/pi-ai` | AI utilities (`StringEnum` for Google-compatible enums) |
 | `@earendil-works/pi-tui` | TUI components for custom rendering |
@@ -1489,8 +1489,12 @@ const active = pi.getActiveTools();
 const all = pi.getAllTools();
 // [{
 //   name: "read",
+//   label: "Read",
 //   description: "Read file contents...",
-//   parameters: ..., 
+//   parameters: ...,
+//   execute: async (...),
+//   renderCall: (...),
+//   renderResult: (...),
 //   sourceInfo: { path: "<builtin:read>", source: "builtin", scope: "temporary", origin: "top-level" }
 // }, ...]
 const names = all.map(t => t.name);
@@ -1499,7 +1503,7 @@ const extensionTools = all.filter((t) => t.sourceInfo.source !== "builtin" && t.
 pi.setActiveTools(["read", "bash"]); // Switch to read-only
 ```
 
-`pi.getAllTools()` returns `name`, `description`, `parameters`, and `sourceInfo`.
+`pi.getAllTools()` returns full tool definitions with `sourceInfo`. Tool items are readonly as a type-level hint; nested schemas are not frozen.
 
 Typical `sourceInfo.source` values:
 - `builtin` for built-in tools
diff --git a/packages/coding-agent/src/core/agent-session.ts b/packages/coding-agent/src/core/agent-session.ts
index d2835b7b088..15f6a6fb47f 100644
--- a/packages/coding-agent/src/core/agent-session.ts
+++ b/packages/coding-agent/src/core/agent-session.ts
@@ -759,13 +759,11 @@ export class AgentSession {
 	}
 
 	/**
-	 * Get all configured tools with name, description, parameter schema, and source metadata.
+	 * Get all configured tools with readonly definitions and source metadata.
 	 */
 	getAllTools(): ToolInfo[] {
 		return Array.from(this._toolDefinitions.values()).map(({ definition, sourceInfo }) => ({
-			name: definition.name,
-			description: definition.description,
-			parameters: definition.parameters,
+			...definition,
 			sourceInfo,
 		}));
 	}
diff --git a/packages/coding-agent/src/core/extensions/types.ts b/packages/coding-agent/src/core/extensions/types.ts
index 58b85227378..865e9660411 100644
--- a/packages/coding-agent/src/core/extensions/types.ts
+++ b/packages/coding-agent/src/core/extensions/types.ts
@@ -1211,7 +1211,7 @@ export interface ExtensionAPI {
 	/** Get the list of currently active tool names. */
 	getActiveTools(): string[];
 
-	/** Get all configured tools with parameter schema and source metadata. */
+	/** Get all configured tools with readonly definitions and source metadata. */
 	getAllTools(): ToolInfo[];
 
 	/** Set the active tools by name. */
@@ -1422,8 +1422,8 @@ export type GetSessionNameHandler = () => string | undefined;
 
 export type GetActiveToolsHandler = () => string[];
 
-/** Tool info with name, description, parameter schema, and source metadata */
-export type ToolInfo = Pick<ToolDefinition, "name" | "description" | "parameters"> & {
+/** Tool definition with source metadata. Readonly is a type-level hint; nested schemas are not frozen. */
+export type ToolInfo = Readonly<ToolDefinition> & {
 	sourceInfo: SourceInfo;
 };
 
diff --git a/packages/coding-agent/src/index.ts b/packages/coding-agent/src/index.ts
index 8627bdcdb95..97533893065 100644
--- a/packages/coding-agent/src/index.ts
+++ b/packages/coding-agent/src/index.ts
@@ -349,6 +349,7 @@ export {
 // Clipboard utilities
 export { copyToClipboard } from "./utils/clipboard.ts";
 export { parseFrontmatter, stripFrontmatter } from "./utils/frontmatter.ts";
+export { convertToPng } from "./utils/image-convert.ts";
 export { formatDimensionNote, type ResizedImage, resizeImage } from "./utils/image-resize.ts";
 // Shell utilities
 export { getShellConfig } from "./utils/shell.ts";