{"adoption": {"forks": 519, "observed_at": "2026-08-28T04:08:07.384327+00:00", "stars": 3498}, "canonical_url": "https://ross.abutalabs.com/products/pettingzoo", "card": {"archived": false, "artifact_type": "library", "description": "A standard API for multi-agent reinforcement learning environments, with popular reference environments and related utilities", "domain": ["reinforcement-learning", "machine-learning", "artificial-intelligence"], "enriched": true, "function": ["reinforcement-learning", "simulation", "game-engine", "testing"], "health_score": 98, "homepage": "https://pettingzoo.farama.org", "language": "Python", "license": "MIT", "license_family": "permissive", "maturity": "active", "member_repos": ["Farama-Foundation/PettingZoo"], "name": "Farama-Foundation/PettingZoo", "platform": ["python"], "pushed_at": "2026-08-13T18:03:26+00:00", "repo": "Farama-Foundation/PettingZoo", "stars": 3498, "tags": ["multi-agent", "gymnasium", "rl-environments", "marl", "farama-foundation", "game-development", "research", "linux", "macos"], "topics": ["api", "gymnasium", "multi-agent-reinforcement-learning", "reinforcement-learning", "multiagent-reinforcement-learning"], "urls": [], "use_cases": ["train multi-agent reinforcement learning agents", "benchmark MARL algorithms on standard environments", "create custom multi-agent RL environments with a standard API", "run multi-player Atari and board game environments for RL research", "integrate MARL environments with CleanRL, Tianshou, RLlib, or Stable-Baselines3"], "what_it_is": "PettingZoo is a Python library providing a standard API for multi-agent reinforcement learning environments, analogous to Gymnasium but for multiple agents. It ships with reference environment families (Atari, Butterfly, Classic, SISL) plus wrappers and utilities for MARL research.", "when_to_avoid": ["you only need single-agent RL environments (use Gymnasium instead)", "you need official Windows support", "you need high-performance production simulation rather than research environments"], "when_to_choose": ["you need a standardized, well-maintained API for multi-agent RL environments", "you want ready-made reference environments like chess, Hanabi, or cooperative Atari games", "you are doing MARL research and want compatibility with popular RL training libraries"]}, "data_as_of": "2026-08-30T08:39:29.467469+00:00", "members": [{"path": "/products/pettingzoo", "repo": "Farama-Foundation/PettingZoo", "role": "main", "score": 89}], "provenance": {"archived": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "artifact_type": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "description": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "domain": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "enriched": {"inputs": [], "kind": "computed", "method": "enrichment_status"}, "function": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "health_score": {"inputs": ["days_since_push", "days_since_release", "archived"], "kind": "computed", "method": "health_v1"}, "homepage": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "language": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "license": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "license_family": {"inputs": ["license"], "kind": "computed", "method": "license_family"}, "maturity": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "member_repos": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "name": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "platform": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "pushed_at": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "repo": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "stars": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "tags": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "topics": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "urls": {"kind": "observed", "observed_at": "2026-08-28T04:08:07.384327+00:00", "source": "github"}, "use_cases": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "what_it_is": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "when_to_avoid": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}, "when_to_choose": {"confidence": null, "enriched_at": "2026-08-29T18:35:50.799644+00:00", "kind": "inferred", "prompt_version": 1, "sources": [{"content_hash": "285b83a55bc8f62c9fc1307f03cc2b2256fe24aa6a9504097246ad05e69ed7b1", "fetched_at": "2026-08-28T04:08:07.384327+00:00", "kind": "readme", "missing": false, "url": "https://github.com/Farama-Foundation/PettingZoo"}, {"content_hash": "d2bd582b7b1f63b77de1b557935f4532c1809b67a90a863b79f865673435a0fa", "fetched_at": "2026-08-29T09:29:55.837722+00:00", "kind": "homepage", "missing": false, "url": "https://pettingzoo.farama.org"}, {"content_hash": "087b5b5e4ed7349ef15bb64c735fcb08910f20159e7a20a9bafa43fef9a88cc4", "fetched_at": "2026-08-29T09:29:55.846664+00:00", "kind": "registry_pypi", "missing": false, "url": "https://pypi.org/pypi/pettingzoo/json"}], "taxonomy_version": 1}}, "score": {"components": {"activity": 97, "longevity": 100, "rhythm": 73}, "computed_at": "2026-09-03T02:20:16.233290+00:00", "flags": [], "formula": "round(0.45*activity + 0.35*rhythm + 0.20*longevity); archived -> min(score, 10)", "inputs": {"age_days": 2417, "days_push": 20, "days_rel": 20, "gap_med": 108, "n_releases_24m": 4}, "score": 89, "version": 2}, "staleness": {"enrichment_outdated": false, "low_confidence": false, "scrape_days": 9, "stale_scrape": false}}