diff --git a/packages/tools/src/claude-memory.test.ts b/packages/tools/src/claude-memory.test.ts
index 7337441a..f51247ce 100644
--- a/packages/tools/src/claude-memory.test.ts
+++ b/packages/tools/src/claude-memory.test.ts
@@ -210,3 +210,42 @@ describe("ClaudeMemoryTool str_replace replacement literalness", () => {
 		expect(stored).toContain(`price is ${dollarSequence} today`)
 	})
 })
+
+describe("ClaudeMemoryTool path normalization collision resistance", () => {
+	it("produces distinct customIds for paths that previously collided", () => {
+		const tool = new ClaudeMemoryTool("test-api-key")
+		const paths = [
+			"/memories/notes.txt",
+			"/memories/notes_txt",
+			"/memories/notes/txt",
+			"/memories/project/a.md",
+			"/memories/project_a.md",
+		]
+
+		const ids = paths.map((path) => tool.normalizePathToCustomId(path))
+		const uniqueIds = new Set(ids)
+
+		expect(uniqueIds.size).toBe(paths.length)
+	})
+
+	it("resolves documents stored under legacy customId format", async () => {
+		// Mock a document saved with legacy normalization (memories_notes_txt)
+		mockDocuments([
+			{
+				id: "legacy-doc",
+				customId: "memories_notes_txt",
+				filePath: "/memories/notes.txt",
+				content: "legacy content",
+			},
+		])
+
+		const tool = new ClaudeMemoryTool("test-api-key")
+		const result = await tool.handleCommand({
+			command: "view",
+			path: "/memories/notes.txt",
+		})
+
+		expect(result.success).toBe(true)
+		expect(result.content).toContain("legacy content")
+	})
+})
diff --git a/packages/tools/src/claude-memory.ts b/packages/tools/src/claude-memory.ts
index 867c4d82..a419fee9 100644
--- a/packages/tools/src/claude-memory.ts
+++ b/packages/tools/src/claude-memory.ts
@@ -57,13 +57,22 @@ export class ClaudeMemoryTool {
 
 	/**
 	 * Normalize file path to be used as customId
-	 * Converts /memories/file.txt -> memories_file_txt
+	 * Reversibly encodes path components to prevent collisions between paths like
+	 * `/memories/notes.txt`, `/memories/notes_txt`, and `/memories/notes/txt`.
 	 */
-	private normalizePathToCustomId(path: string): string {
+	normalizePathToCustomId(path: string): string {
 		return path
 			.replace(/^\//, "") // Remove leading slash
-			.replace(/\//g, "_") // Replace / with _
-			.replace(/\./g, "_") // Replace . with _
+			.replace(/_/g, "__") // Escape underscores: _ -> __
+			.replace(/\//g, "_s_") // Encode slashes: / -> _s_
+			.replace(/\./g, "_d_") // Encode dots: . -> _d_
+	}
+
+	/**
+	 * Legacy normalization used in older versions (/ and . both flattened to _)
+	 */
+	private legacyNormalizePathToCustomId(path: string): string {
+		return path.replace(/^\//, "").replace(/\//g, "_").replace(/\./g, "_")
 	}
 
 	constructor(apiKey: string, config?: ClaudeMemoryConfig) {
@@ -650,8 +659,12 @@ export class ClaudeMemoryTool {
 				})
 
 				for (const document of response.memories) {
+					const isMatchingCustomId =
+						document.customId === normalizedId ||
+						document.customId === this.legacyNormalizePathToCustomId(filePath)
+
 					if (
-						document.customId === normalizedId &&
+						isMatchingCustomId &&
 						this.getDocumentFilePath(document) === filePath &&
 						this.isDocumentInConfiguredScope(document)
 					) {
diff --git a/packages/tools/src/tool-operations.test.ts b/packages/tools/src/tool-operations.test.ts
index 8efef91d..0439c5ca 100644
--- a/packages/tools/src/tool-operations.test.ts
+++ b/packages/tools/src/tool-operations.test.ts
@@ -344,7 +344,9 @@ describe("ClaudeMemoryTool", () => {
 
 		expect(result.success).toBe(true)
 		expect(clientAdd).toHaveBeenCalledWith(
-			expect.objectContaining({ customId: "memories_renamed_txt" }),
+			expect.objectContaining({
+				customId: tool.normalizePathToCustomId("/memories/renamed.txt"),
+			}),
 		)
 		expect(documentsDeleteBulk).toHaveBeenCalledWith({ ids: [DOCUMENT_ID] })
 	})