# Create Environments > Create or migrate verifiers environments for the Prime Lab ecosystem. Use when asked to build a new environment from scratch, port an eval or benchmark from papers or other libraries, start from an environment on the Hub, or convert existing tasks into a package that exposes load_environment and installs cleanly with prime env install. Use when this capability is needed. - Skill: `tomevault-io/create-environments` (Agent Skill, multi-file: 2 files) - Install (CLI): `npx skillmds@latest add tomevault-io/create-environments` - Raw SKILL.md: https://api.skillmd.com/api/skills/tomevault-io/create-environments/raw - Safety review: pending - Works with: Claude Code, Claude.ai, OpenAI Codex - Category: Coding & Dev Tools - Author: tomevault-io (https://skillmd.com/u/tomevault-io) - Updated: 2026-09-17 - Page: https://skillmd.com/skills/tomevault-io/create-environments --- # Create Environments ## Goal Build production-quality verifiers environments that work immediately in the Prime ecosystem: install, load, evaluate, and train without hidden setup. ## Start With Ecosystem Paths 1. Prefer ecosystem-native setup before custom scaffolding. 2. Use this default loop: ```bash prime env init my-env prime env install my-env prime eval run my-env -m gpt-4.1-mini -n 5 ``` 3. Treat `prime eval run` as the canonical eval path. It saves results automatically, so do not add `--skip-upload` unless the user explicitly requests that deviation. 4. Prefer an existing environment as a starting point when possible: ```bash prime env list --search "keyword" prime env info owner/name prime env install owner/name ``` 5. For repository examples, use repo install when available: ```bash prime env install math-python --from-repo ``` 6. Encourage users to keep endpoint aliases in `configs/endpoints.toml` so smoke tests can switch models quickly. 7. Ask users whether they want instruct or reasoning models for validation. 8. Instruct-first smoke choices: `gpt-4.1` series, `qwen3` instruct series. 9. Reasoning validation choices: `gpt-5` series, `qwen3` thinking series, `glm` series. ## Build Modes ### 1. Build From Scratch 1. Define task contract first: prompt shape, allowed tools, stop conditions, rubric outputs, metrics. 2. Select the smallest correct base class: - `SingleTurnEnv` for one-response tasks. - `MultiTurnEnv` for custom interaction loops. - `ToolEnv` or `MCPEnv` for stateless tools. - `StatefulToolEnv` for per-rollout resources. - `CliAgentEnv` for running agent binaries in sandboxes with API interception. Override `get_sandbox_resources(state)` for per-instance resources, `build_env_vars(state)` for custom env vars. - `ComposableEnv` (with `TaskSet`/`SandboxTaskSet` + `Harness`) for separating *what to solve* from *how to solve it*. Define a `TaskSet` (dataset, instructions, sandbox spec, rubric) and a `Harness` (install script, run command, system prompt), wire them together with zero subclassing. Use `SandboxTaskSet` when tasks need sandboxes with per-instance images/resources. 3. Implement `load_environment(...) -> vf.Environment` with explicit arguments. 4. Add `pyproject.toml` defaults in `[tool.verifiers.eval]` only when stable. ### 2. Port From Another Library, Project, or Paper 1. Create a strict source-to-target mapping before coding: - dataset rows and splits - prompt rendering and role ordering - tool I/O schema and stop logic - scoring math and aggregation - pass/fail thresholds and special cases 2. Preserve one-to-one logical equivalence for what the model sees and what gets scored. 3. Never invent unresolved formatting decisions. Ask the user to decide explicitly. 4. Benchmark runtime and remove avoidable bottlenecks before handoff. ### 3. Start From Hub Environment 1. Install or pull the closest baseline: ```bash prime env install owner/name prime env pull owner/name -t ./tmp-env ``` 2. Keep proven interfaces stable unless a migration is deliberate and explicit. 3. Re-run smoke evals after each major change. ## Non-Negotiable Quality Rules 1. Use deterministic, well-defined reward checks or LLM judges. 2. Avoid best-effort deterministic heuristics such as keyword style checks except as an explicit last resort with user sign-off. 3. Make environments self-contained after install. Do not require users to run background servers before `load_environment()`. 4. Manage external resources inside the environment lifecycle. 5. Validate required secrets in `load_environment()` via `vf.ensure_keys(...)`. 6. Surface feature limits directly. Do not ship hacky workarounds without explicit user approval. ## Verification Gate Run these before claiming completion: ```bash prime env install my-env prime eval run my-env -m gpt-4.1-mini -n 5 prime eval run my-env -m gpt-4.1-mini -n 50 -r 1 -s ``` If multi-turn or tool-heavy, also run with higher rollouts: ```bash prime eval run my-env -m gpt-4.1-mini -n 30 -r 3 -s ``` ## Publish Gate Before Large Evals Or Training 1. After smoke tests pass and behavior is stable, recommend pushing to Hub before large evals or RL training. 2. Ask the user explicitly whether visibility should be `PUBLIC` or `PRIVATE`. 3. Use: ```bash prime env push my-env --visibility PUBLIC ``` or ```bash prime env push my-env --visibility PRIVATE ``` 4. For hosted or large-scale workflows, prefer running with the Hub slug after push: ```bash prime eval run owner/my-env -m gpt-4.1-mini -n 200 -r 3 -s ``` ## Synthetic Data 1. Ask users for preferences on which LLMs to use for synthetic data generation and curation before implementation. 2. Prefer generating synthetic data from raw source documents whenever possible instead of relying only on hand-authored prompts. 3. Use LLM orchestration (planner/generator/validator loops) to improve sample quality and diversity. 4. Use back-translation: start from complete materials and decompose them into incomplete tasks, criteria, or partial artifacts that the model must reconstruct. 5. Use fan-out subtopic sampling from LLMs to expand coverage and avoid overfitting to a narrow slice of the domain. ## Deliverable Format Report: 1. Environment ID and path. 2. Exact install and eval commands used. 3. Port-equivalence notes if migrated. 4. Any unresolved user decisions that block strict fidelity. --- > Converted and distributed by [TomeVault](https://tomevault.io/claim/primeintellect-ai) — claim your Tome and manage your conversions.