README.md

metadata

license: apache-2.0
task_categories:
  - text-generation
language:
  - en
tags:
  - reflection-ai
  - build-with-beam
  - beam-1.0-501b-a23b
  - mcp
  - legacy-modernization
  - differential-verification
  - code-benchmarks
pretty_name: Legacy2MCP-Bench (Real GitHub Repositories · 160 Differential Vectors)
size_categories:
  - n<1K
configs:
  - config_name: default
    data_files:
      - split: test
        path: legacy2mcp_bench.jsonl

Legacy2MCP-Bench (v2 · 100% Real GitHub Ground-Truth Corpus)

Legacy2MCP-Bench is a verifiable 160-vector enterprise modernization benchmark built for the Reflection AI × Hugging Face "Build with Beam" competition. Every row measures whether an LLM can refactor a real, production multi-file GitHub Python repository into a zero-dependency standalone Anthropic Model Context Protocol (MCPServer v2) module that achieves bit-exact parity against the untouched original GitHub library.

Cloned GitHub Repositories & Commits

Repo ID	Public GitHub Repository	Git Commit	Domain & Compliance Regime	Raw Cloned Tokens (Beam-1.0 BPE)	AST-Compacted Pack (Beam-1.0 BPE)	Vectors	Single-Chunk RAG Parity	Whole-Repo + Self-Heal Parity
py_moneyed	limist/py-moneyed	4c90ed5	ISO-4217 Treasury & Pro-Rata Allocation	15,826	8,660	40	37/40 (92.5%)	40/40 (100.0%)
price_parser	scrapinghub/price-parser	6718bfe	Global eCommerce Price & Locale Extraction	19,246	16,495	40	29/40 (72.5%)	40/40 (100.0%)
schwifty	mdomke/schwifty	7462c6e	ISO-13616 IBAN / BBAN / SWIFT-BIC	2,400,664	1,882	40	24/40 (60.0%)	40/40 (100.0%)
python_stdnum	arthurdejong/python-stdnum	006192e	ISIN / CUSIP / SEDOL / FIGI / ABA / EIN / EU VAT	639,812	5,745	40	24/40 (60.0%)	40/40 (100.0%)
Total	4 Real GitHub Repos (447 files)	—	Enterprise Finance, Tax & Commerce	3,075,548	32,782 (98.9% saved)	160	114/160 (71.25%)	160/160 (100.00%)

Schema (legacy2mcp_bench.jsonl)

Each of the 160 JSONL rows contains:

• benchmark_id: Unique vector ID (PY_MONEYED-01 .. PYTHON_STDNUM-40)
• github_repo, github_url, git_commit_sha: Exact upstream GitHub provenance
• mcp_tool_name, category, label, input_arguments: Structured MCP tool invocation payload
• ground_truth_output: Exact JSON output produced by executing the untouched GitHub library
• synthesized_mcp_output: Exact JSON output produced by executing the standalone LLM-synthesized MCPServer module (zero legacy library imports enforced via Python AST audit)
• whole_repo_1m_exact_match (bool), single_chunk_rag_exact_match (bool)
• whole_repo_openrouter_request_ids, single_chunk_openrouter_request_id: Verifiable OpenRouter generation IDs (gen-...)
• official_beam_bpe_packed_tokens: Exact token count measured with reflection/Beam-1.0-501B-A23B tokenizer.json (vocab_size=151,681)
• parity_certificate_sha256: Cryptographic verification digest