lean-reasoning-help

name	lean-reasoning-help
description	Auxiliary proof-strategy help for hard Lean theorem repairs. Use when repeated focused attempts fail and another configured model or command expert should advise without editing files or changing existing statements.

Lean Reasoning Help

Use this skill for hard theorem-local blockers after normal proof workflow steps have produced useful context but no working proof.

Contract

1. Preserve the assigned theorem/lemma/example statement exactly.
2. Call lean_reasoning_help with the theorem id, file path, current diagnostics, current attempt, and recent failed attempts.
3. Treat the result as advice only; do not accept it until a concrete edit passes lean_incremental_check(check_target) for the assigned declaration, or lean_verify(mode=file_exact) when doing a final Lake sweep or explicit canonical check.
4. Do not use auxiliary advice to justify deleting, weakening, renaming, moving, or replacing the declaration with sorry.
5. If the advice suggests a statement change, report that as a blocker instead of applying it.
6. If the advice suggests sorry, admit, axioms, unsafe code, or another placeholder, ignore that part and continue with verified proof repair.
7. Helper lemmas or private supporting declarations are acceptable advice when they preserve existing statements and directly support the assigned theorem.
8. If the advisor is unavailable, returns no answer, or gives irrelevant advice, continue the main Lean workflow from the strongest verified local evidence; missing advice is not evidence that the theorem statement is wrong.

Configuration

lean_reasoning_help routes through the shared auxiliary client task lean_reasoning by default. When explicitly configured with codex or claude-code, it instead invokes the corresponding command expert in an advisory mode.

Configure it with either:

• auxiliary.lean_reasoning.provider
• auxiliary.lean_reasoning.model
• auxiliary.lean_reasoning.base_url
• auxiliary.lean_reasoning.api_key
• auxiliary.lean_reasoning.command_template
• auxiliary.lean_reasoning.codex_command_template
• auxiliary.lean_reasoning.claude_code_command_template

or environment overrides:

• AUXILIARY_LEAN_REASONING_PROVIDER
• AUXILIARY_LEAN_REASONING_MODEL
• AUXILIARY_LEAN_REASONING_BASE_URL
• AUXILIARY_LEAN_REASONING_API_KEY
• AUXILIARY_LEAN_REASONING_COMMAND_TEMPLATE
• LEANFLOW_EXPERT_CODEX_COMMAND_TEMPLATE
• LEANFLOW_EXPERT_CLAUDE_CODE_COMMAND_TEMPLATE

Workflow launches can also pass --expert-provider codex, --expert-provider claude-code, and --expert-command-template .... Command experts receive the advisor prompt on stdin and must still be treated as unverified advice.