config: [mcp] section with server definitions and disable gate

tests/test_config/test_mcp_section.py

@@ -0,0 +1,66 @@
+"""[mcp] section parse: server definitions, disable gate, malformed fallback."""
+
+from __future__ import annotations
+
+from plyngent.config import load
+
+
+def test_mcp_defaults_and_parse(tmp_path) -> None:
+    path = tmp_path / "c.toml"
+    _ = path.write_text("", encoding="utf-8")
+    store = load(path)
+    assert store.mcp_config.servers == {}
+    assert store.mcp_config.disable == []
+
+    path.write_text(
+        """
+[mcp.servers.docs]
+command = "npx"
+args = ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"]
+env = { RUST_LOG = "info" }
+timeout = 10.0
+read_only = true
+
+[mcp.servers.search]
+command = "uvx"
+args = ["mcp-server-fetch"]
+
+[mcp]
+disable = ["search"]
+""",
+        encoding="utf-8",
+    )
+    store = load(path)
+    mcp = store.mcp_config
+    assert set(mcp.servers) == {"docs", "search"}
+    docs = mcp.servers["docs"]
+    assert docs.command == "npx"
+    assert docs.args == ["-y", "@modelcontextprotocol/server-filesystem", "/tmp"]
+    assert docs.env == {"RUST_LOG": "info"}
+    assert docs.timeout == 10.0
+    assert docs.read_only is True
+    assert docs.url == ""
+    assert mcp.disable == ["search"]
+
+
+def test_mcp_malformed_section_falls_back_to_defaults(tmp_path) -> None:
+    path = tmp_path / "c.toml"
+    # Unknown section key.
+    path.write_text("[mcp]\nenabled = true\n", encoding="utf-8")
+    store = load(path)
+    assert store.mcp_config.servers == {}
+
+    # Unknown server key (typo).
+    path.write_text('[mcp.servers.docs]\ncmds = "npx"\n', encoding="utf-8")
+    store = load(path)
+    assert store.mcp_config.servers == {}
+
+    # Server entry is not a table.
+    path.write_text("[mcp]\nservers = 3\n", encoding="utf-8")
+    store = load(path)
+    assert store.mcp_config.servers == {}
+
+    # Empty server name.
+    path.write_text('[mcp.servers.""]\ncommand = "npx"\n', encoding="utf-8")
+    store = load(path)
+    assert store.mcp_config.servers == {}