Borrowing it
Nothing to install: this file belongs to tobiasosborne/alethfeld. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/tobiasosborne/alethfeld/legacy/.claude/commands/fix-sorries.mdgit clone --depth 1 https://github.com/tobiasosborne/alethfeldWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/commands/tobiasosborne/alethfeld/fix-sorries)<a href="https://agentmods.dev/commands/tobiasosborne/alethfeld/fix-sorries"><img src="https://agentmods.dev/badge/commands/tobiasosborne/alethfeld/fix-sorries/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/commands/tobiasosborne/alethfeld/fix-sorries"><img src="https://agentmods.dev/badge/commands/tobiasosborne/alethfeld/fix-sorries.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What it costs to keep this loaded
Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5.1 | $0.00010 | $0.00519 |
| Opus 5 | $0.00005 | $0.00260 |
| Sonnet 5 | $0.00002 | $0.00104 |
| Haiku 4.5 | $0.00001 | $0.00052 |
Grade A, and why
fix-sorries scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 11d ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Nothing flagged
None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.
What it actually says
Sorry Elimination Protocol
Systematically find and fix all sorry statements in the Lean 4 codebase.
Phase 1: Discovery
-
Run lake build to get current state:
cd lean && lake build 2>&1 -
Find all sorries:
grep -rn "sorry" --include="*.lean" lean/AlethfeldLean/ -
Create a todo list with all sorry locations, ordered by dependency (fix dependencies first).
Phase 2: Analysis
For each sorry:
- Read the context - the theorem statement, available lemmas, imports
- Understand what needs to be proved - the goal type
- Check Mathlib for relevant lemmas that could help
- Identify the proof strategy:
- Direct computation?
- Apply existing lemma?
- Induction?
- Case split?
- Rewrite chain?
Phase 3: Fix
For each sorry (in dependency order):
-
Attempt the fix using appropriate tactics:
simp,ring,linarithfor arithmeticexact,apply,refinefor applying lemmasrwfor rewritesconstructor,usefor existentialsintro,introsfor implications/universals
-
Build and check:
cd lean && lake build 2>&1 | head -50 -
If successful: Mark todo complete, move to next
-
If stuck: Note the issue, create a beads issue, move on
Phase 4: Verification
After all sorries addressed:
-
Full build:
cd lean && lake build -
Count remaining sorries:
grep -c "sorry" lean/AlethfeldLean/**/*.lean 2>/dev/null || echo "0" -
Report results
Output
Track progress with TodoWrite. Report:
- Total sorries found
- Sorries fixed
- Sorries remaining (with reasons)
- Build status
What this file has done since we first saw it
Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.
- 11d ago First seen · 80 lines · 10 tokens per session scan A 2ac1b233ed89
fix-sorries is a command published in the GitHub repository tobiasosborne/alethfeld (144 stars, last pushed 3mo ago), licensed MIT. It adds 10 tokens to every session and 519 once invoked, about $0.0001 per session on Opus 5. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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