feat: generate Cursor IDE data-agent rules alongside OpenCode

.gitignore

@@ -24,6 +24,7 @@ coverage.xml
 docs/data-catalog/
 history/
 .opencode/rules/data-agent.md
+.cursor/rules/data-agent.mdc
 evals/results/
 
 # BMAD framework installation (tool infrastructure, not project code)

AGENTS.md

@@ -15,9 +15,12 @@ customers?", "Show me top products by revenue", "How many orders last month?"):
 4. Read the relevant per-table doc under `docs/data-catalog/` for column names and types.
 5. Run `uv run oda query "<SQL>"` to execute the query and return results to the user.
 
-The active database connection and full command reference are in `.opencode/rules/data-agent.md`.
-Read that file if you need to know which database is active or how to use `oda` commands.
-That file is generated by running `uv run oda connect <name>` from the project root.
+The active database connection and full command reference are in the IDE rules file:
+- **Cursor:** `.cursor/rules/data-agent.mdc` (auto-loaded via `alwaysApply`)
+- **OpenCode:** `.opencode/rules/data-agent.md`
+
+Both files are generated by running `uv run oda connect <name>` from the project root.
+Read the appropriate file if you need to know which database is active or how to use `oda` commands.
 
 ## What this project does
 

src/open_data_agent/cli_connections.py

@@ -196,6 +196,7 @@ def connect(name: str) -> None:
     console.print(f"[green]✓[/green] Connected to {name} ({db_type} @ {host}/{database})")
 
     _render_opencode_rules(name, params)
+    _render_cursor_rules(name, params)
 
     from pathlib import Path
 
@@ -246,3 +247,43 @@ def _render_opencode_rules(name: str, params: dict[str, object]) -> None:
     rules_file.write_text(rendered)
 
     console.print(f"[green]✓[/green] OpenCode rules written to {rules_file}")
+
+
+def _render_cursor_rules(name: str, params: dict[str, object]) -> None:
+    """Render the Cursor IDE rules file from the same template with .mdc frontmatter."""
+    import importlib.resources
+    from datetime import datetime
+    from pathlib import Path
+
+    template_content: str | None = None
+
+    if hasattr(importlib.resources, "files"):
+        try:
+            ref = importlib.resources.files("open_data_agent") / "templates" / "data-agent.md.tmpl"
+            template_content = ref.read_text(encoding="utf-8")
+        except (FileNotFoundError, OSError, TypeError):
+            pass
+
+    if template_content is None:
+        return
+
+    rendered = template_content.replace("{{connection_name}}", str(name))
+    rendered = rendered.replace("{{db_type}}", str(params.get("db_type", "")))
+    rendered = rendered.replace("{{db_host}}", str(params.get("host", "")))
+    rendered = rendered.replace("{{db_name}}", str(params.get("database", "")))
+    rendered = rendered.replace("{{generated_at}}", datetime.now(UTC).isoformat(timespec="seconds"))
+
+    frontmatter = (
+        "---\n"
+        "description: Data agent rules — active DB connection context, "
+        "ODA CLI commands, and self-healing guidance\n"
+        "alwaysApply: true\n"
+        "---\n\n"
+    )
+
+    rules_dir = Path(".cursor") / "rules"
+    rules_dir.mkdir(parents=True, exist_ok=True)
+    rules_file = rules_dir / "data-agent.mdc"
+    rules_file.write_text(frontmatter + rendered)
+
+    console.print(f"[green]✓[/green] Cursor rules written to {rules_file}")

src/open_data_agent/cli_init.py

@@ -64,6 +64,7 @@ def init() -> None:
         r"  2. Activate it:          oda connect <name>" + "\n"
         "  3. Generate schema docs: oda docs generate\n"
         '  4. Start querying!       oda query "SELECT ..."\n'
-        "\nOpenCode users: rules file will be at .opencode/rules/data-agent.md\n"
-        r"after you run 'oda connect <name>'"
+        "\nIDE agent rules are generated after you run 'oda connect <name>':\n"
+        "  - Cursor:   .cursor/rules/data-agent.mdc\n"
+        "  - OpenCode: .opencode/rules/data-agent.md"
     )