mathsolver-swift

BYOK AI math solver with execution-based verification (PAL-style) — bring your own OpenAI-compatible API key; the answer is computed locally by executing a model-generated program, never taken from a number the model stated.

// instantiate once with your own credentials, solve many
solver = new Client(apiKey, baseUrl?, model?)
result = solver.solve(problem)
  -> { answer, steps[], program, check, checkValue (check_value), verified, retries }

1. Calls your OpenAI-compatible endpoint (any base_url) with a strict-JSON prompt.
2. The model returns a small program (a JavaScript-like arithmetic dialect), explanation steps, and a check expression containing {x} — the model never states the answer as a number.
3. The package executes the program locally with its own interpreter (recursive-descent parser, no eval, no model code execution). The execution output IS the answer.
4. The check expression is evaluated with the computed answer substituted for {x} and must equal ~0 — for equations, substitute the answer back into the original equation (e.g. 2x+3=11 -> 2*{x}+3-11); for arithmetic, recompute via a different path and subtract the answer.
5. Program error or failed check -> automatic corrective retry (max 1). verified: true means the check passed; verified: false means it never did — treat those answers with care.

• ✅ the answer is produced by local program execution — the model has no way to "declare" a result.
• ✅ verified: true means an independent check expression evaluated to ~0.
• ❌ proof steps / textual reasoning are model-generated and NOT step-verified.
• ❌ if the model misreads the problem, a self-consistent program+check can still be wrong.

See .github/workflows/test.yml (CI runs on every push). Tests cover the expression evaluator (precedence, env variables), the program interpreter (let / result / bare expressions), check substitution, answer-comes-from-execution (model JSON contains no answer field), check-fail retry-recover, program-error retry, PROGRAM_* persistent error, invalid-JSON retry, double-invalid error, HTTP error no-retry, NO_API_KEY guard — plus an HTTP-interface mock (no server, no sockets) that runs the default transport's real code path and asserts URL, headers, body, temperature and the corrective retry payload.

Maintained by mathsolver.help — free step-by-step math solver, try it online.