feat: add comment support (list, get, create, update, delete)

Add 5 new MCP tools for managing Docmost page comments:
- list_comments: list all comments on a page (paginated)
- get_comment: retrieve a single comment by ID
- create_comment: create page-level or inline comments with replies
- update_comment: update existing comment content
- delete_comment: remove a comment

Comment content is automatically converted between Markdown (agent-facing)
and ProseMirror/TipTap JSON (Docmost API). Uses the existing
markdown-converter for reading and a new markdown-to-json utility
for writing.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

README.md

@@ -20,6 +20,14 @@ A Model Context Protocol (MCP) server for [Docmost](https://docmost.com/), enabl
 - **`list_pages`**: List pages within a space (ordered by `updatedAt` descending).
 - **`get_page`**: Retrieve full content and metadata of a specific page.
 
+### Comments
+
+- **`list_comments`**: List all comments on a page with content converted to Markdown.
+- **`get_comment`**: Retrieve a single comment by ID.
+- **`create_comment`**: Create a page-level or inline comment. Content is provided as Markdown and automatically converted to ProseMirror JSON. Supports replies via `parentCommentId`.
+- **`update_comment`**: Update an existing comment's content (creator only).
+- **`delete_comment`**: Delete a comment (creator or space admin only).
+
 ### Technical Details
 
 - **Automatic Markdown Conversion**: Page content is automatically converted from Docmost's internal ProseMirror/TipTap JSON format to clean Markdown for easy agent consumption. Supports all Docmost extensions including callouts, task lists, math blocks, embeds, and more.

src/index.ts

@@ -8,6 +8,7 @@ import {
   filterSpace,
   filterGroup,
   filterPage,
+  filterComment,
   filterSearchResult,
 } from "./lib/filters.js";
 import { convertProseMirrorToMarkdown } from "./lib/markdown-converter.js";
@@ -16,6 +17,7 @@ import { fileURLToPath } from "url";
 import { dirname, join } from "path";
 import { updatePageContentRealtime } from "./lib/collaboration.js";
 import { getCollabToken, performLogin } from "./lib/auth-utils.js";
+import { markdownToTiptapJson } from "./lib/markdown-to-json.js";
 
 // Read version from package.json
 const __filename = fileURLToPath(import.meta.url);
@@ -328,6 +330,80 @@ class DocmostClient {
     );
     return Promise.all(promises);
   }
+
+  // --- Comment Methods ---
+
+  async listComments(pageId: string) {
+    const comments = await this.paginateAll("/comments", { pageId });
+    return comments.map((comment: any) => {
+      const markdown = comment.content
+        ? convertProseMirrorToMarkdown(comment.content)
+        : "";
+      return filterComment(comment, markdown);
+    });
+  }
+
+  async getComment(commentId: string) {
+    await this.ensureAuthenticated();
+    const response = await this.client.post("/comments/info", { commentId });
+    const comment = response.data.data || response.data;
+    const markdown = comment.content
+      ? convertProseMirrorToMarkdown(comment.content)
+      : "";
+    return {
+      data: filterComment(comment, markdown),
+      success: true,
+    };
+  }
+
+  async createComment(
+    pageId: string,
+    content: string,
+    type: "page" | "inline" = "page",
+    selection?: string,
+    parentCommentId?: string,
+  ) {
+    await this.ensureAuthenticated();
+    const jsonContent = await markdownToTiptapJson(content);
+    const payload: Record<string, any> = {
+      pageId,
+      content: jsonContent,
+      type,
+    };
+    if (selection) payload.selection = selection;
+    if (parentCommentId) payload.parentCommentId = parentCommentId;
+
+    const response = await this.client.post("/comments/create", payload);
+    const comment = response.data.data || response.data;
+    const markdown = comment.content
+      ? convertProseMirrorToMarkdown(comment.content)
+      : content;
+    return {
+      data: filterComment(comment, markdown),
+      success: true,
+    };
+  }
+
+  async updateComment(commentId: string, content: string) {
+    await this.ensureAuthenticated();
+    const jsonContent = await markdownToTiptapJson(content);
+    const response = await this.client.post("/comments/update", {
+      commentId,
+      content: jsonContent,
+    });
+    return {
+      success: true,
+      commentId,
+      message: "Comment updated successfully.",
+    };
+  }
+
+  async deleteComment(commentId: string) {
+    await this.ensureAuthenticated();
+    return this.client
+      .post("/comments/delete", { commentId })
+      .then((res) => res.data);
+  }
 }
 
 const docmostClient = new DocmostClient(API_URL);
@@ -544,6 +620,115 @@ server.registerTool(
   },
 );
 
+// --- Comment Tools ---
+
+// Tool: list_comments
+server.registerTool(
+  "list_comments",
+  {
+    description:
+      "List all comments on a page. Returns comments with content converted to Markdown.",
+    inputSchema: {
+      pageId: z.string().describe("ID of the page to list comments for"),
+    },
+  },
+  async ({ pageId }) => {
+    const comments = await docmostClient.listComments(pageId);
+    return jsonContent(comments);
+  },
+);
+
+// Tool: get_comment
+server.registerTool(
+  "get_comment",
+  {
+    description: "Get a single comment by ID with content as Markdown.",
+    inputSchema: {
+      commentId: z.string().describe("ID of the comment"),
+    },
+  },
+  async ({ commentId }) => {
+    const comment = await docmostClient.getComment(commentId);
+    return jsonContent(comment);
+  },
+);
+
+// Tool: create_comment
+server.registerTool(
+  "create_comment",
+  {
+    description:
+      "Create a new comment on a page. Content is provided as Markdown and automatically converted to the required format.",
+    inputSchema: {
+      pageId: z.string().describe("ID of the page to comment on"),
+      content: z.string().describe("Comment content in Markdown format"),
+      type: z
+        .enum(["page", "inline"])
+        .optional()
+        .describe(
+          "Comment type: 'page' for general page comment (default), 'inline' for text selection comment",
+        ),
+      selection: z
+        .string()
+        .optional()
+        .describe(
+          "Selected text for inline comments (max 250 chars). Required when type is 'inline'.",
+        ),
+      parentCommentId: z
+        .string()
+        .optional()
+        .describe("Parent comment ID to create a reply (max 2 nesting levels)"),
+    },
+  },
+  async ({ pageId, content, type, selection, parentCommentId }) => {
+    const result = await docmostClient.createComment(
+      pageId,
+      content,
+      type || "page",
+      selection,
+      parentCommentId,
+    );
+    return jsonContent(result);
+  },
+);
+
+// Tool: update_comment
+server.registerTool(
+  "update_comment",
+  {
+    description:
+      "Update an existing comment's content. Only the comment creator can update it. Content is provided as Markdown.",
+    inputSchema: {
+      commentId: z.string().describe("ID of the comment to update"),
+      content: z.string().describe("New comment content in Markdown format"),
+    },
+  },
+  async ({ commentId, content }) => {
+    const result = await docmostClient.updateComment(commentId, content);
+    return jsonContent(result);
+  },
+);
+
+// Tool: delete_comment
+server.registerTool(
+  "delete_comment",
+  {
+    description:
+      "Delete a comment. Only the comment creator or space admin can delete it.",
+    inputSchema: {
+      commentId: z.string().describe("ID of the comment to delete"),
+    },
+  },
+  async ({ commentId }) => {
+    await docmostClient.deleteComment(commentId);
+    return {
+      content: [
+        { type: "text", text: `Successfully deleted comment ${commentId}` },
+      ],
+    };
+  },
+);
+
 async function run() {
   const transport = new StdioServerTransport();
   await server.connect(transport);

src/lib/filters.ts

@@ -60,6 +60,21 @@ export function filterPage(page: any, content?: string, subpages?: any[]) {
   };
 }
 
+export function filterComment(comment: any, markdownContent?: string) {
+  return {
+    id: comment.id,
+    pageId: comment.pageId,
+    content: markdownContent ?? comment.content,
+    selection: comment.selection || null,
+    type: comment.type || "page",
+    parentCommentId: comment.parentCommentId || null,
+    creatorId: comment.creatorId,
+    creatorName: comment.creator?.name || null,
+    createdAt: comment.createdAt,
+    editedAt: comment.editedAt || null,
+  };
+}
+
 export function filterSearchResult(result: any) {
   return {
     id: result.id,

src/lib/markdown-to-json.ts

@@ -0,0 +1,25 @@
+/**
+ * Convert Markdown text to TipTap/ProseMirror JSON format
+ * Used for creating and updating comments via Docmost API
+ */
+import { marked } from "marked";
+import { generateJSON } from "@tiptap/html";
+import { JSDOM } from "jsdom";
+import { tiptapExtensions } from "./tiptap-extensions.js";
+
+// Ensure DOM environment is available (may already be set by collaboration.ts)
+if (typeof global.document === "undefined") {
+  const dom = new JSDOM("<!DOCTYPE html><html><body></body></html>");
+  global.window = dom.window as any;
+  global.document = dom.window.document;
+  // @ts-ignore
+  global.Element = dom.window.Element;
+}
+
+/**
+ * Convert markdown string to TipTap-compatible ProseMirror JSON
+ */
+export async function markdownToTiptapJson(markdown: string): Promise<any> {
+  const html = await marked.parse(markdown);
+  return generateJSON(html, tiptapExtensions);
+}