Add Markdown Viewer Online to the tool directory

_tools/markdown-viewer-online.md

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+---
+title: Markdown Viewer Online
+category: "documents"
+description: "See what your agent changed without rereading the whole plan."
+icon: markdown-viewer-online.svg
+website: https://markdown.madebyolof.com/
+syntax:
+  - id: headings
+    available: y
+  - id: paragraphs
+    available: y
+  - id: line-breaks
+    available: y
+  - id: bold
+    available: y
+  - id: italic
+    available: y
+  - id: blockquotes
+    available: y
+  - id: ordered-lists
+    available: y
+  - id: unordered-lists
+    available: y
+  - id: code
+    available: y
+  - id: horizontal-rules
+    available: y
+  - id: links
+    available: p
+    notes: "Web, email and document-section links are supported. Relative file links are displayed as text."
+  - id: images
+    available: n
+    notes: "Images are replaced with a text placeholder."
+  - id: tables
+    available: y
+  - id: fenced-code-blocks
+    available: y
+  - id: syntax-highlighting
+    available: n
+  - id: footnotes
+    available: y
+  - id: heading-ids
+    available: p
+    notes: "Heading IDs are generated automatically. Custom IDs are not supported."
+  - id: definition-lists
+    available: n
+  - id: strikethrough
+    available: y
+  - id: task-lists
+    available: y
+    notes: "Checkboxes are displayed but cannot be changed."
+  - id: emoji-cp
+    available: y
+  - id: emoji-sc
+    available: n
+  - id: highlight
+    available: n
+  - id: subscript
+    available: n
+  - id: superscript
+    available: n
+  - id: auto-url-linking
+    available: y
+  - id: disabling-auto-url
+    available: y
+  - id: html
+    available: n
+    notes: "Raw HTML tags are ignored."
+---
+
+[markdown.madebyolof.com](https://markdown.madebyolof.com/) shows what changed between versions of AI-generated plans and documentation. As your agent revises a plan, the rendered diff lets you read the changes without rereading the whole document. Clear typography and a simple layout keep the text easy to read.
+
+Your agent can open it for you, right in your browser. It's free, with no installation, skills or MCP setup required.
+
+Local files and pasted text are read in the browser. The API route sends the document text to the service and returns a reader link. Anyone with that link can read the snapshot; it does not update when the original file changes.
+
+The reader uses react-markdown with remark-gfm. It supports tables, task lists and strikethrough alongside basic Markdown. It does not edit or save documents. Images are not loaded, relative file links are inactive, and raw HTML is ignored.
+
+{% include tool-syntax-table.html %}