---

name: symbolic-tasks description: "Guides CPU-only BDDL activity discovery, problem parsing, initial and goal condition inspection, symbolic scope construction, grounding, callback-based evaluation, natural-language rendering, and safe syntax validation. Use for BDDL activities, behavior task definitions, .bddl problems, predicates, object scope, or activity lists." disable-model-invocation: true metadata: disco-role: operating license: NO_LICENSE

Symbolic Tasks

Use this sub-skill for symbolic BDDL work that needs only the bddl Python package and packaged activity/domain data.

Route

1. Confirm the package before inspecting definitions:

   python -m pip install "bddl==3.7.0"
   python -c "from importlib.metadata import version; import bddl; print(version('bddl'))"
   

2. For a read-only packaged activity inspection, run:

   python sub-skills/symbolic-tasks/scripts/inspect_bddl_activity.py --activity <activity> --instance 0 --domain behavior-1k
   

   Omit --activity to list packaged activities. Add --natural-language for readable conditions or --tokens for the raw nested token tree.

3. Read API reference before constructing parsed conditions, scopes, compiled expressions, grounded options, evaluation callbacks, or BDDL text.

4. Read troubleshooting when activity lookup, packaged files, syntax, predicates, scope, grounding, or evaluation fails.

Boundaries

• This route covers symbolic parsing, representation, inspection, compilation, grounding, and callback-driven Boolean evaluation on CPU.
• It does not launch a simulator, populate physical scenes, execute robot behavior, provide object-state implementations, or establish that a symbolic task is physically feasible.
• Route object taxonomy, synset abilities, generated object metadata, and knowledge-base model questions to the sibling knowledge-base sub-skill. Return here after obtaining the object categories or metadata needed for a symbolic condition.
• Do not import OmniGibson or Isaac Sim for these workflows.