| --- |
| license: "mit" |
| language: |
| - en |
| pretty_name: "Schema Mutation" |
| tags: |
| - benchmark |
| - llm-evaluation |
| - ai-benchmark |
| - model-evaluation |
| - evals |
| - grading |
| - openrouter |
| - openai |
| - mcp |
| - typescript |
| - agent-benchmark |
| - function-calling |
| - tool-use |
| - openapi |
| - schema-migration |
| task_categories: |
| - text-generation |
| size_categories: |
| - n<1K |
| configs: |
| - config_name: default |
| data_files: |
| - split: test |
| path: data/tasks.jsonl |
| --- |
| |
| # Schema Mutation |
|
|
| Tool schemas change. Does the model call the current one? |
|
|
| ## What it measures |
|
|
| Whether a model follows the current tool schema after a migration — renamed fields, new required fields, changed enums, split endpoints and type changes — instead of the version it memorized. |
|
|
| Category: `tools`. Status: `alpha`. |
|
|
| ## How to run |
|
|
| ```console |
| $ npx benchmark-schema-mutation list |
| $ npx benchmark-schema-mutation run --model <model-id> --provider openrouter |
| $ npx benchmark-schema-mutation score results.json |
| ``` |
|
|
| `--provider mock` runs the whole benchmark offline with no keys. Real models run |
| through OpenRouter (`OPENROUTER_API_KEY`) or any OpenAI-compatible base URL |
| (`OPENAI_BASE_URL`, `OPENAI_API_KEY`). |
|
|
| ## Data fields |
|
|
| `data/tasks.jsonl` holds 60 tasks, one JSON object per line |
| (kinds: 60 single). |
|
|
| | field | type | |
| |---|---| |
| | `id` | string | |
| | `kind` | string | |
| | `prompt` | string | |
| | `expected` | string | |
| | `metadata` | object | |
|
|
| ## Provenance |
|
|
| # Schema Mutation provenance |
|
|
| This file is generated from the benchmark definition. |
|
|
| ## Seeded schema-mutation task generator |
|
|
| - Kind: `synthetic` |
| - URL: https://github.com/pooriaarab/benchmark-schema-mutation/blob/main/scripts/gen-tasks.mjs |
| - Licence: `MIT` |
| - Retrieved: 2026-10-15T00:00:00.000Z |
| - How to get it: Run `node scripts/gen-tasks.mjs` for the public split (seed 20261015) or `node scripts/gen-tasks.mjs --seed <n> --split hidden` for a held-out split. |
| - Contamination notes: All 60 public tasks are synthetic mutations of 12 hand-authored base tool schemas. The hidden split uses a different seed, which selects different values, mutation variants, field names and enum targets, and is never committed, so public tasks may enter training data without leaking final evaluation items. |
| - Refresh: Change the seed, rerun the generator, and review the JSONL diff. Rotate mutation parameters quarterly. |
|
|
|
|
| ## Grader |
|
|
| Canonical JSON equality on the tool name and arguments after normalisation; exact matches against the pre-migration call are reported as staleSchemaUsed. |
|
|
| ## Limitations |
|
|
| This dataset contains only the public task split (60 tasks). |
| Hidden evaluation splits use a private seed and are deliberately not part of |
| this dataset. Source kinds: synthetic. These are evaluation prompts |
| for the `benchmark-schema-mutation` benchmark, not training data; scoring requires the package's |
| deterministic grader. See PROVENANCE.md for contamination notes. |
|
|
| ## Citation |
|
|
| ```bibtex |
| @misc{benchmark_schema_mutation, |
| author = {Pooria Arab}, |
| title = {Schema Mutation task data}, |
| year = {2026}, |
| url = {https://github.com/pooriaarab/benchmark-schema-mutation} |
| } |
| ``` |
|
|
| ## Links |
|
|
| - npm: https://www.npmjs.com/package/benchmark-schema-mutation |
| - GitHub: https://github.com/pooriaarab/benchmark-schema-mutation |
| - Leaderboard: https://aibenchmarkindex.com/benchmarks/benchmark-schema-mutation |
| - Dataset: https://huggingface.co/datasets/pooria/benchmark-schema-mutation |
|
|
