Problem

ReactTranslationAgent.get_project_tree (RepoTransAgent/run.py:246) shells out to tree:

result = subprocess.run(["tree", str(self.working_path), "-L", "3"], ...)

but docker/Dockerfile never installs it — grep -c tree docker/Dockerfile returns 0 on main.

The failure is silent. subprocess.run raises FileNotFoundError before returning, so the find fallback under the returncode == 0 check is unreachable, and the outer handler converts it to a string that is passed to the model as its observation:

Error getting project structure: [Errno 2] No such file or directory: 'tree'

Evidence

A 20-iteration C → Python run (antirez_smaz) on an image built from your docker/Dockerfile's Python 3.11 stanza — same apt-get install list, Java/.NET/Go/Rust/Node layers omitted as that task never touches them — produces the error string in all 20 turns, with no turn receiving a file listing.

As a control, the same agent run against an image that does install tree receives a real listing in all 20 turns. So the behaviour tracks the missing package and nothing else.

Why it matters beyond a log line

get_project_tree is the only channel telling the agent which files currently exist, and slide_window_conversation (generator.py:72) retains only the previous turn — so that listing is effectively the agent's record of its own progress. With it replaced by an error string, the agent re-derives project state from scratch each turn.

Fix

Add tree to the existing apt-get install list.

This changes what the agent sees, and therefore scores. Noting it explicitly for the same reason as #5.