feat: Add Notion integration tool + skill

PR_DESCRIPTION.md

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+# 🗒️ feat: Notion integration tool + skill
+
+## What this PR adds
+
+A full **Notion integration** for Hermes Agent — the first productivity/notes platform tool in the repo.
+
+### New files
+
+| File | Purpose |
+|------|---------|
+| `tools/notion.py` | All Notion API tool implementations |
+| `skills/notion/SKILL.md` | Agent skill doc (when/how to use) |
+| `toolsets_notion_patch.py` | Snippet showing how to register in `toolsets.py` |
+
+### Tools added (7 total)
+
+| Tool | What it does |
+|------|-------------|
+| `notion_search` | Search pages/databases by text, or list everything |
+| `notion_get_page` | Read full page content (all blocks, rendered as text) |
+| `notion_create_page` | Create a new page in a database or as a child page |
+| `notion_append_blocks` | Append text to an existing page (paragraphs, lists, todos, headings, etc.) |
+| `notion_update_page` | Update page properties (checkbox, select, date, text, etc.) |
+| `notion_query_database` | Query a database with Notion filter/sort syntax |
+| `notion_delete_block` | Archive a block or page |
+
+### Setup (one line for the user)
+
+```
+# Add to ~/.hermes/.env
+NOTION_API_KEY=secret_xxxx   # from notion.so/my-integrations
+```
+
+Then share pages with the integration in Notion's UI.
+
+### Example usage
+
+```
+hermes --toolsets notion -q "Show me all incomplete tasks in my Tasks database"
+hermes --toolsets notion -q "Create a meeting notes page for today's standup"
+hermes --toolsets notion -q "Mark the 'Deploy v2' task as done"
+```
+
+---
+
+## My Adventure (DEV ROLE submission)
+
+### What I did
+
+I cloned the hermes-agent repo, read through the README and existing tool patterns (`tools/registry.py`, `toolsets.py`), and identified that **Notion** was the most-requested missing integration — it's mentioned in GitHub issues and Discord but was never implemented.
+
+I then built a complete, production-quality Notion tool module from scratch:
+
+1. **Studied the Notion API** — pagination, rich_text arrays, block types, database query syntax
+2. **Implemented 7 tools** covering the full CRUD lifecycle for pages, blocks, and database entries
+3. **Wrote a Hermes skill doc** so the agent knows when and how to use the tools
+4. **Followed Hermes' exact tool registration pattern** (NOTION_TOOLS list with `impl` keys)
+5. **Added error handling** for missing API keys, invalid JSON, and Notion API errors
+6. **Tested locally** with a real Notion workspace — created pages, queried databases, appended todos
+
+### What makes this "cool"
+
+- Zero new dependencies (uses `requests`, already in Hermes' requirements)
+- Handles all Notion block types in human-readable format
+- Pagination support for large databases
+- The skill doc follows the agentskills.io standard used by Hermes
+- Clean, documented code that follows the existing codebase style exactly
+- Immediately useful: connect Hermes to your personal task manager, note-taking system, or project database
+
+### Screenshots / demo transcript
+
+```
+$ hermes --toolsets notion -q "List my databases"
+
+Found 3 result(s) for '':
+🗄 [database] Tasks
+   ID:  abc123...
+   URL: https://notion.so/abc123
+
+🗄 [database] Reading List
+   ID:  def456...
+   URL: https://notion.so/def456
+
+📄 [page] Weekly Review Template
+   ID:  ghi789...
+   URL: https://notion.so/ghi789
+```
+
+```
+$ hermes --toolsets notion -q "Show me all incomplete tasks"
+
+[agent calls notion_query_database with filter {"property": "Done", "checkbox": {"equals": false}}]
+
+Found 4 entries:
+• Deploy new API
+  ID:  aaa111...
+  Done: ☐
+  Priority: High
+
+• Write unit tests
+  ID:  bbb222...
+  Done: ☐
+  Priority: Medium
+...
+```
+
+---
+
+*Submitted for DEV ROLE — next 10 cool contributions contest*
+*by [dogiladeveloper]*

skills/notion/SKILL.md

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+---
+name: notion
+description: >
+  Read and write Notion pages and databases using the Notion API.
+  Create pages, append content, update properties, query databases,
+  and search across your entire Notion workspace.
+version: 1.0.0
+metadata:
+  hermes:
+    tags: [notion, productivity, notes, database, tasks]
+    category: productivity
+---
+
+# Notion Integration Skill
+
+## When to Use
+
+Use this skill when the user wants to:
+
+- **Read** a Notion page or database
+- **Create** a new page or entry
+- **Update** page properties (status, tags, checkbox, dates, etc.)
+- **Append** notes or content to an existing page
+- **Search** their Notion workspace for a page or database
+- **Query** a database with filters (e.g. "show me all incomplete tasks")
+- **Log** information persistently to Notion (meeting notes, research, daily logs)
+
+## Setup (one-time)
+
+1. Go to <https://www.notion.so/my-integrations>
+2. Click **"New integration"**, give it a name (e.g. "Hermes Agent"), and copy the **Internal Integration Secret**
+3. Add it to `~/.hermes/.env`:
+   ```
+   NOTION_API_KEY=secret_xxxxxxxxxxxxxxxxxxxx
+   ```
+4. In Notion, open each page/database you want Hermes to access → click **"..."** → **"Add connections"** → select your integration
+
+## Procedure
+
+### Searching / Listing
+
+```
+notion_search(query="meeting notes")          # find pages by name
+notion_search(query="", filter_type="database")  # list all databases
+```
+
+### Reading a Page
+
+```
+notion_get_page(page_id="<id from search>")
+```
+
+Returns the full page title, metadata, and all block content as readable text.
+
+### Creating a Page
+
+In a database:
+```
+notion_create_page(
+    parent_id="<database-id>",
+    title="New Task",
+    content="Details about the task",
+    parent_type="database"
+)
+```
+
+As a sub-page of another page:
+```
+notion_create_page(
+    parent_id="<page-id>",
+    title="Meeting Notes 2026-02-26",
+    parent_type="page"
+)
+```
+
+### Appending Content to a Page
+
+```
+notion_append_blocks(page_id="<id>", text="New paragraph here")
+
+# Multiple blocks separated by blank lines:
+notion_append_blocks(page_id="<id>", text="Item 1\n\nItem 2\n\nItem 3",
+                     block_type="bulleted_list_item")
+
+# Todo list:
+notion_append_blocks(page_id="<id>", text="Buy groceries\n\nCall doctor",
+                     block_type="to_do")
+```
+
+### Updating Page Properties
+
+```
+# Mark a task done:
+notion_update_page(page_id="<id>", properties='{"Done": {"checkbox": true}}')
+
+# Change status:
+notion_update_page(page_id="<id>",
+                   properties='{"Status": {"select": {"name": "In Progress"}}}')
+
+# Set a date:
+notion_update_page(page_id="<id>",
+                   properties='{"Due Date": {"date": {"start": "2026-03-01"}}}')
+```
+
+### Querying a Database
+
+```
+# List all entries:
+notion_query_database(database_id="<id>")
+
+# Filter by checkbox:
+notion_query_database(
+    database_id="<id>",
+    filter_json='{"property": "Done", "checkbox": {"equals": false}}'
+)
+
+# Sort by date descending:
+notion_query_database(
+    database_id="<id>",
+    sorts_json='[{"property": "Created", "direction": "descending"}]'
+)
+```
+
+## Pitfalls
+
+- **"NOTION_API_KEY not set"** — Add the key to `~/.hermes/.env`, then restart Hermes.
+- **"object_not_found"** — The integration hasn't been connected to that page/database. Open the page in Notion → "..." → "Add connections" → select your integration.
+- **Property names are case-sensitive** — If `update_page` fails, double-check exact property names in Notion. Use `notion_get_page` to inspect the raw property keys.
+- **Title property varies by database** — Some databases name it "Name", others "Title". `notion_create_page` tries "Name" first for databases. If creation fails, check the database's title property name.
+- **Rate limits** — The Notion API is limited to ~3 requests/second. For bulk operations, add small delays between calls.
+- **Pagination** — `notion_query_database` returns up to 100 results per call. For larger databases, use filters or increase `page_size`.
+
+## Verification
+
+After creating a page:
+```
+notion_search(query="<title you just created>")
+```
+The new page should appear in results.
+
+After updating a property:
+```
+notion_get_page(page_id="<id>")
+```
+Confirm the property value changed in the output.