docs(tools): clarify coding tool guidance

tests/tools/test_tool_descriptions.py

@@ -0,0 +1,46 @@
+from nanobot.agent.tools.apply_patch import ApplyPatchTool
+from nanobot.agent.tools.exec_session import ListExecSessionsTool, WriteStdinTool
+from nanobot.agent.tools.filesystem import EditFileTool, ReadFileTool, WriteFileTool
+from nanobot.agent.tools.search import FindFilesTool, GrepTool
+from nanobot.agent.tools.shell import ExecTool
+
+
+def test_coding_tool_descriptions_steer_editing_priority() -> None:
+    apply_patch = ApplyPatchTool().description.lower()
+    edit_file = EditFileTool().description.lower()
+    write_file = WriteFileTool().description.lower()
+
+    assert "default tool for code edits" in apply_patch
+    assert "multi-file" in apply_patch
+    assert "dry_run=true" in apply_patch
+    assert "edit_file only for small exact replacements" in apply_patch
+
+    assert "small, exact replacement" in edit_file
+    assert "copied from read_file" in edit_file
+    assert "prefer apply_patch" in edit_file
+
+    assert "replace an entire file" in write_file
+    assert "prefer apply_patch" in write_file
+
+
+def test_coding_tool_descriptions_steer_discovery_and_shell_usage() -> None:
+    read_file = ReadFileTool().description.lower()
+    find_files = FindFilesTool().description.lower()
+    grep = GrepTool().description.lower()
+    exec_tool = ExecTool().description.lower()
+    write_stdin = WriteStdinTool().description.lower()
+    list_sessions = ListExecSessionsTool().description.lower()
+
+    assert "find_files/list_dir first" in read_file
+    assert "before editing" in read_file
+    assert "prefer it over shell find/ls" in find_files
+    assert "prefer this over shell grep" in grep
+
+    assert "tests, builds" in exec_tool
+    assert "prefer read_file/find_files/grep" in exec_tool
+    assert "apply_patch/write_file/edit_file" in exec_tool
+    assert "yield_time_ms" in exec_tool
+
+    assert "do not use this to start new commands" in write_stdin
+    assert "wait_for" in write_stdin
+    assert "recover a session_id" in list_sessions