title	Skill Invocation Environment
colorFrom	indigo
colorTo	gray
sdk	docker
pinned	false
app_port	8000
base_path	/web
tags	openenv

Skill Invocation Environment

An OpenEnv RL environment that trains LLMs to make better decisions about when to invoke procedural knowledge (skills) during task-solving.

Why This Matters

SkillsBench showed that AI agents fail to invoke available skills ~56% of the time, even when skills would significantly help. This environment creates a training ground for this specific problem.

When Skills Are Irreplaceable

Skills are essential when the task requires knowledge that:

1. Cannot be derived from general training data (e.g., proprietary API authentication protocols)
2. Has precise, non-obvious specifications (e.g., binary format byte layouts, exact CLI commands)
3. Would be impossible to guess correctly (e.g., specific error code formats, deployment phase configurations)

Context Cost Model

Skills aren't free — each loaded skill consumes context budget. The environment rewards precision: agents that load only the skills they need get higher rewards than agents that load everything.

Actions

• load(skill_id) — Load full skill content into context (costs budget)
• unload(skill_id) — Remove skill from context (frees budget)
• submit(answer) — Submit solution (reward computed on loaded state at submit time)

The skill catalog (short descriptions) is returned in every observation, so agents always know what's available. The unload mechanic is key: agents can load a skill to read it, decide it's not useful, and unload it before submitting to avoid the bloat penalty.

Reward Function

correctness  = 0.6  if answer is correct, else 0.0
precision    = 0.3 × (relevant loaded / total loaded)
recall       = 0.1 × (relevant loaded / total relevant)
bloat        = -0.15 per unnecessary skill loaded at submit time
total        = max(correctness + precision + recall + bloat, -1.0)

Scenario	Correct?	Loaded	Relevant	Reward
Right skill, correct answer	Yes	{A}	{A}	1.0
Right skill + 1 distractor	Yes	{A,B}	{A}	0.7
All 6 loaded, correct	Yes	{A,B,C,D,E,F}	{A}	0.0
No skills loaded, correct	Yes	{}	{A}	0.6
Right skill, wrong answer	No	{A}	{A}	0.4

Best policy: load exactly the right skill(s), solve correctly → 1.0

Quick Start

Install

pip install -e .

Run Locally (Direct)

from skill_invocation_env.models import SkillInvocationAction
from skill_invocation_env.server.skill_invocation_env_environment import SkillInvocationEnvironment

env = SkillInvocationEnvironment()
obs = env.reset(seed=42)

print(f"Task: {obs.task_description}")
print(f"Skills: {[s['name'] for s in obs.skill_catalog]}")

# Load a skill (costs context)
obs = env.step(SkillInvocationAction(action_type="load", skill_id=obs.skill_catalog[0]["id"]))
print(f"Skill content: {obs.skill_content[:200]}...")
print(f"Context: {obs.context_budget_used}/{obs.context_budget_total}")

# Unload if not needed
obs = env.step(SkillInvocationAction(action_type="unload", skill_id=obs.loaded_skills[0]))

# Submit answer
obs = env.step(SkillInvocationAction(action_type="submit", answer="your solution here"))
print(f"Reward: {obs.reward}, Done: {obs.done}")

Run Server

cd skill_invocation_env
uvicorn server.app:app --host 0.0.0.0 --port 8000

Use Client

from skill_invocation_env import SkillInvocationEnv, SkillInvocationAction

with SkillInvocationEnv(base_url="http://localhost:8000") as client:
    result = client.reset()
    print(f"Task: {result.observation.task_description}")

    # Load a skill
    skill_id = result.observation.skill_catalog[0]["id"]
    result = client.step(SkillInvocationAction(action_type="load", skill_id=skill_id))

    # Submit
    result = client.step(SkillInvocationAction(action_type="submit", answer="solution"))
    print(f"Reward: {result.reward}")

Docker

docker build -t skill-invocation-env -f server/Dockerfile .
docker run -p 8000:8000 skill-invocation-env

Task Domains

The environment includes 13 tasks (10 synthetic + 3 from SkillsBench) across 9 domains, each with 5-8 skills in the catalog (1-2 relevant + 4-6 distractors):

Domain	Skills	Tasks	Difficulty
Zephyr-3 API	Auth, Rate Limiting, Webhooks	1	Easy
NovaBin Format	File Spec, Compression	2	Easy, Medium
HelixLang	Error Handling, Modules, Concurrency	1	Easy
ArcDeploy	Canary Rollout, Service Mesh, Monitoring	1	Easy
CrystalQL	Temporal Queries, Index Optimization	1	Easy
VaultSync	Secret Rotation, Access Policies	1	Medium
FluxStream	Event Processing, Connectors, Schema	1	Medium
Cross-domain	CrystalQL + VaultSync	1	Hard
Cross-domain	ArcDeploy + FluxStream	1	Hard
Flood Detection*	Flood Detection, USGS Data, NWS Thresholds	1	Easy
Economics Detrending*	HP Filter, Pandas, Matplotlib	1	Medium
Dialogue Parsing*	Dialogue Graph, Graphviz, JSON Schema	1	Medium

*Adapted from SkillsBench (see below).

SkillsBench Integration

Three tasks are adapted from SkillsBench (Apache 2.0), the first benchmark for evaluating how well AI agents use skills. SkillsBench proved that agents fail to invoke skills ~56% of the time. Our environment provides the RL training ground to fix this.

Adapted tasks use real SkillsBench skill content, distilled into our text-in/text-out Gymnasium format with deterministic code execution verifiers.

Procedural Task Generation

The environment includes a TaskGenerator that creates unlimited unique tasks at runtime, preventing LLM memorization of fixed task content.

Templates

Template	What It Randomizes	Verifier
auth_protocol	API name, hash algo (SHA-256/384/512/MD5), signing format, header format	HMAC exec
binary_format	Format name, magic bytes, endianness, flag names/bits	struct exec

Usage

from skill_invocation_env.server.skill_invocation_env_environment import SkillInvocationEnvironment

# Procedural mode: every reset() generates a unique task
env = SkillInvocationEnvironment(use_procedural=True, procedural_seed=42)
obs = env.reset(seed=0)  # unique task from seed 0
obs = env.reset(seed=1)  # completely different task

Testing

python test_env.py  # 33 tests

Project Structure

skill_invocation_env/
├── __init__.py
├── models.py              # Pydantic Action/Observation/State
├── client.py              # SkillInvocationEnv(EnvClient)
├── task_bank.py           # 13 tasks + 27 skills + verifiers
├── task_generator.py      # Procedural task generator (2 templates)
├── README.md
├── openenv.yaml
├── pyproject.toml
├── train_demo.py          # Integration demo script
├── test_env.py            # Local test suite (33 tests)
└── server/
    ├── skill_invocation_env_environment.py  # Core Environment logic
    ├── app.py                               # FastAPI server
    ├── requirements.txt
    └── Dockerfile