worked on foundation for new conversational crews. Now going to work on chatting.

src/crewai/cli/fetch_crew_inputs.py

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+import json
+import subprocess
+
+import click
+from packaging import version
+
+from crewai.cli.utils import read_toml
+from crewai.cli.version import get_crewai_version
+
+
+def fetch_crew_inputs() -> set[str]:
+    """
+    Fetch placeholders/inputs for the crew by running 'uv run fetch_inputs'.
+    This captures stdout (which is now expected to be JSON),
+    parses it into a Python list/set, and returns it.
+    """
+    command = ["uv", "run", "fetch_inputs"]
+    placeholders = set()
+
+    crewai_version = get_crewai_version()
+    min_required_version = "0.87.0"  # TODO: Update to latest version when cut
+
+    pyproject_data = read_toml()
+
+    # Check for old poetry-based setups
+    if pyproject_data.get("tool", {}).get("poetry") and (
+        version.parse(crewai_version) < version.parse(min_required_version)
+    ):
+        click.secho(
+            f"You are running an older version of crewAI ({crewai_version}) that uses poetry pyproject.toml.\n"
+            f"Please run `crewai update` to update your pyproject.toml to use uv.",
+            fg="red",
+        )
+
+    try:
+        result = subprocess.run(command, capture_output=True, text=True, check=True)
+        # The entire stdout should now be a JSON array of placeholders (e.g. ["topic","username",...])
+        stdout_str = result.stdout.strip()
+        if stdout_str:
+            try:
+                placeholders_list = json.loads(stdout_str)
+                if isinstance(placeholders_list, list):
+                    placeholders = set(placeholders_list)
+            except json.JSONDecodeError:
+                click.echo("Unable to parse JSON from `fetch_inputs` output.", err=True)
+    except subprocess.CalledProcessError as e:
+        click.echo(f"An error occurred while fetching inputs: {e}", err=True)
+        click.echo(e.output, err=True, nl=True)
+
+        if pyproject_data.get("tool", {}).get("poetry"):
+            click.secho(
+                "It's possible that you are using an old version of crewAI that uses poetry.\n"
+                "Please run `crewai update` to update your pyproject.toml to use uv.",
+                fg="yellow",
+            )
+
+    except Exception as e:
+        click.echo(f"An unexpected error occurred: {e}", err=True)
+
+    return placeholders