Spec Writer
garrytan/gstack
Converts a vague idea into a precise, executable spec in five phases, files it as an issue and can start an agent on it in a fresh worktree.
A skill your agent uses when reconciling software specs, docs, tests, configs, code, logs, or incidents with formal methods.
No licenceAuto-check passed
Install Formal Methods Reconciler
$ npx skills add mizchi/skills --skill formal-methods-reconciler -a claude-codeProject install by default; add -g for ~/.claude/skills/.
$ gh skill install mizchi/skills formal-methods-reconciler --agent claude-codeProject scope by default; add --scope user for a personal install. Needs GitHub CLI 2.90.0 or later (public preview).
$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .claude/skills && cp -r skills-src/formal-methods-reconciler .claude/skills/formal-methods-reconciler && rm -rf skills-srcUse ~/.claude/skills/ instead of .claude/skills for a personal install. The folder must contain SKILL.md.
Claude Code skills documentation · loads skills from .claude/skills/
Install the "formal-methods-reconciler" agent skill from https://github.com/mizchi/skills/tree/main/formal-methods-reconciler into .claude/skills/formal-methods-reconciler/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "formal-methods-reconciler", then confirm the skill loads.Claude Code copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$skill-installer install https://github.com/mizchi/skills/tree/main/formal-methods-reconcilerType this inside Codex. $skill-installer <name> installs a curated skill from openai/skills. The installer writes to $CODEX_HOME/skills (default ~/.codex/skills). Restart Codex if the skill does not show up.
$ npx skills add mizchi/skills --skill formal-methods-reconciler -a codexProject install goes to .agents/skills/; add -g for ~/.codex/skills/.
$ gh skill install mizchi/skills formal-methods-reconciler --agent codexProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .agents/skills && cp -r skills-src/formal-methods-reconciler .agents/skills/formal-methods-reconciler && rm -rf skills-srcUse ~/.agents/skills/ instead of .agents/skills for a personal install.
Codex skills documentation · loads skills from .agents/skills/
Install the "formal-methods-reconciler" agent skill from https://github.com/mizchi/skills/tree/main/formal-methods-reconciler into .agents/skills/formal-methods-reconciler/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "formal-methods-reconciler", then confirm the skill loads.Codex copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mizchi/skills --skill formal-methods-reconciler -a cursorProject install goes to .agents/skills/; add -g for ~/.cursor/skills/.
$ gh skill install mizchi/skills formal-methods-reconciler --agent cursorProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .cursor/skills && cp -r skills-src/formal-methods-reconciler .cursor/skills/formal-methods-reconciler && rm -rf skills-srcUse ~/.cursor/skills/ instead of .cursor/skills for a personal install.
Cursor skills documentation · loads skills from .cursor/skills/, .agents/skills/, .claude/skills/, .codex/skills/
Install the "formal-methods-reconciler" agent skill from https://github.com/mizchi/skills/tree/main/formal-methods-reconciler into .cursor/skills/formal-methods-reconciler/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "formal-methods-reconciler", then confirm the skill loads.Cursor copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gemini skills install https://github.com/mizchi/skills.git --path formal-methods-reconciler--scope user (default) or --scope workspace; --path is the subfolder of the repo that holds the skill; --consent skips the security confirmation prompt.
$ npx skills add mizchi/skills --skill formal-methods-reconciler -a gemini-cliProject install goes to .agents/skills/; add -g for ~/.gemini/skills/.
$ gh skill install mizchi/skills formal-methods-reconciler --agent gemini-cliProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .gemini/skills && cp -r skills-src/formal-methods-reconciler .gemini/skills/formal-methods-reconciler && rm -rf skills-srcUse ~/.gemini/skills/ instead of .gemini/skills for a personal install, then run /skills reload.
Gemini CLI skills documentation · loads skills from .gemini/skills/, .agents/skills/
Install the "formal-methods-reconciler" agent skill from https://github.com/mizchi/skills/tree/main/formal-methods-reconciler into .gemini/skills/formal-methods-reconciler/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "formal-methods-reconciler", then confirm the skill loads.Gemini CLI copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ gh skill install mizchi/skills formal-methods-reconcilerInstalls for Copilot at project scope by default; add --scope user for a personal install. Preview a skill first with gh skill preview. Needs GitHub CLI 2.90.0 or later (public preview).
$ npx skills add mizchi/skills --skill formal-methods-reconciler -a github-copilotProject install goes to .agents/skills/; add -g for ~/.copilot/skills/.
$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .github/skills && cp -r skills-src/formal-methods-reconciler .github/skills/formal-methods-reconciler && rm -rf skills-srcUse ~/.copilot/skills/ instead of .github/skills for a personal install. Commit .github/skills so cloud agent and code review can use it.
GitHub Copilot skills documentation · loads skills from .github/skills/, .claude/skills/, .agents/skills/
Install the "formal-methods-reconciler" agent skill from https://github.com/mizchi/skills/tree/main/formal-methods-reconciler into .github/skills/formal-methods-reconciler/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "formal-methods-reconciler", then confirm the skill loads.GitHub Copilot copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
$ npx skills add mizchi/skills --skill formal-methods-reconciler -a opencodeOpenCode documents no install command of its own. Project install goes to .agents/skills/; add -g for ~/.config/opencode/skills/.
$ gh skill install mizchi/skills formal-methods-reconciler --agent opencodeProject scope by default (.agents/skills/); add --scope user for a personal install.
$ git clone --depth 1 https://github.com/mizchi/skills.git skills-src && mkdir -p .opencode/skills && cp -r skills-src/formal-methods-reconciler .opencode/skills/formal-methods-reconciler && rm -rf skills-srcUse ~/.config/opencode/skills/ instead of .opencode/skills for a personal install.
OpenCode skills documentation · loads skills from .opencode/skills/, .claude/skills/, .agents/skills/
Install the "formal-methods-reconciler" agent skill from https://github.com/mizchi/skills/tree/main/formal-methods-reconciler into .opencode/skills/formal-methods-reconciler/ in this project. Copy the whole folder (SKILL.md and every file beside it), keep the folder name "formal-methods-reconciler", then confirm the skill loads.OpenCode copies the folder itself, the same result as the manual copy. Check what it changed before you commit it.
Facts
- Skill name
formal-methods-reconciler- GitHub stars
- 360
- Token cost
- ~1.9k tokens
- SKILL.md length
- 965 words
- Files
- 13 (incl. references)
- Skills in repo
- 69
- Repo updated
- First seen
- Licence
- None found
At a glance
A skill your agent uses when reconciling software specs, docs, tests, configs, code, logs, or incidents with formal methods.
- Works in 9 steps: Choose the source of truth. → Extract claims before choosing a tool. → Classify the shape of the question. → …
- Reconciling software specs
- SKILL.md covers Workflow, Reporting Discipline, LLM Role Boundary and Research-Informed Patterns, plus 2 more sections
- Instructions only: no scripts, shell commands, URLs or credentials in SKILL.md
What it does
Formal Methods Reconciler is an agent skill from mizchi/skills. Use when reconciling software specs, docs, tests, configs, code, logs, or incidents with formal methods. Helps Codex extract claims, decide whether docs or implementation are the source of truth, choose an appropriate tool such as Z3, Alloy, TLA+, P, Dafny, MoonBit prove, Lean, Rocq, Why3, Verus, CBMC, Tamarin, or ProVerif, build the smallest useful model, run or plan verifier checks, and translate SAT/UNSAT, traces, proof failures, or proof obligations into domain-language questions and regression guards.
Its SKILL.md is about 1.9k tokens, which your agent loads only when the skill is triggered. The skill folder holds 16 other files, including reference files (for example `README.md`, `SKILL-ja.md` and `agents/openai.yaml`).
The repository describes itself as: Agent skills by mizchi, distributed via APM.
When your agent uses it
- Reconciling software specs
- Incidents with formal methods
Example prompts
- “/formal-methods-reconciler”
Workflow steps
9 steps, taken from the first numbered list in SKILL.md.
- Choose the source of truth.
- Extract claims before choosing a tool.
- Classify the shape of the question.
- Select the smallest appropriate tool.
- Build the minimum model.
- Run verifier feedback loops.
- Reproduce the witness against the implementation.
- Translate results to domain language.
- Lock decisions.
What it can do on your machine
Read from SKILL.md and the folder at commit 62f5808. It shows what the files ask for, not the result of running them.
Tool permissions
Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.
From allowed-tools in the SKILL.md frontmatter.
Runs code
No scripts in the folder and no shell commands in SKILL.md.
From the folder's file list and the shell code blocks in SKILL.md.
Network
No URLs in SKILL.md.
From URLs in SKILL.md, links to its own repository left out.
Credentials
Names no API keys, tokens, secrets or passwords.
From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.
Context cost
Formal Methods Reconciler loads about 1.9k tokens when it runs, and up to ~5.3k if it reads all its reference files. Until then it costs about 134 tokens; SKILL.md has 965 words of instructions outside code blocks.
Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.
Safety
Auto-check passed
The automated check found no risky patterns in SKILL.md.
Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.
SKILL.md
Without a licence we can't republish the file, so here is its outline and opening line. It has 965 words (~1,915 tokens).
“Use this skill to turn a vague correctness concern into a small formal-methods check and a domain-readable decision record.”
- name
- formal-methods-reconciler
Files
SKILL.md and 12 other files (references) in formal-methods-reconciler of mizchi/skills.
- SKILL.md
- README.md
- SKILL-ja.md
- agents/openai.yaml
- evals/eval.yaml
- evals/ledger.yaml
- evals/tasks/scenario-a-config-z3.yaml
- evals/tasks/scenario-b-authz-alloy.yaml
- evals/tasks/scenario-c-async-tla-p.yaml
- references/domain-ledger.md
- references/reference-implementations.md
- references/research-patterns.md
- references/tool-selection.md
Open the folder on GitHubat commit 62f5808
Compare with similar skills
Formal Methods Reconciler next to the 5 skills that share the most tags, products or categories with it. Stars are the repository's; “used in” counts other GitHub owners with a copy.
| Skill | Stars | Used in | Tokens | Auto-check | Licence | Repo updated |
|---|---|---|---|---|---|---|
| Formal Methods Reconciler this skillmizchi/skills | 360 | — | ~1.9k | Automated safety check: Pass | None | |
| Spec Writergarrytan/gstack | 136k | — | ~14k | Automated safety check: Notes | MIT | |
| Specgarden-co/classic-jazz | 2.5k | — | ~1.3k | Automated safety check: Pass | MIT | |
| Spec Driven Workflowalirezarezvani/claude-skills | 28k | — | ~3.9k | Automated safety check: Pass | MIT | |
| Sparc Specruvnet/ruflo | 74k | — | ~1.1k | Automated safety check: Notes | MIT | |
| Write A Specdifferent-ai/openwork | 24k | — | ~3.3k | Automated safety check: Pass | Custom licence |
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Questions about Formal Methods Reconciler
What does Formal Methods Reconciler do?
A skill your agent uses when reconciling software specs, docs, tests, configs, code, logs, or incidents with formal methods. Formal Methods Reconciler is an agent skill from mizchi/skills. Use when reconciling software specs, docs, tests, configs, code, logs, or incidents with formal methods.
When should I use Formal Methods Reconciler?
Formal Methods Reconciler fits situations like: reconciling software specs; incidents with formal methods.
How do I install Formal Methods Reconciler in Claude Code?
Run `npx skills add mizchi/skills --skill formal-methods-reconciler -a claude-code`. Or copy the skill folder (formal-methods-reconciler in mizchi/skills) into .claude/skills/formal-methods-reconciler in your project. Claude Code loads it when a task matches its description.
How do I install Formal Methods Reconciler in Codex?
Run `npx skills add mizchi/skills --skill formal-methods-reconciler -a codex`. Or copy the skill folder (formal-methods-reconciler in mizchi/skills) into .agents/skills/formal-methods-reconciler in your project. Codex loads it when a task matches its description.
Can I use Formal Methods Reconciler in Cursor, Gemini CLI or GitHub Copilot?
Cursor, Gemini CLI, GitHub Copilot and OpenCode also load SKILL.md folders. With the skills CLI, run `npx skills add mizchi/skills --skill formal-methods-reconciler -a cursor` (or -a gemini-cli, github-copilot or opencode for the others). To copy it by hand, put the folder in .cursor/skills/formal-methods-reconciler, .gemini/skills/formal-methods-reconciler, .github/skills/formal-methods-reconciler and .opencode/skills/formal-methods-reconciler in your project.
What does Formal Methods Reconciler need to run?
SKILL.md names no scripts, command-line tools or credentials: Formal Methods Reconciler is instructions for the agent only.
Does Formal Methods Reconciler access the network?
SKILL.md contains no URLs. Any network use would come from the scripts or tools the agent runs. This is read from the text; nothing was executed.
Is Formal Methods Reconciler safe to install?
Our automated static check of SKILL.md found no risky patterns, such as piping downloads into a shell, reading credential files or hidden Unicode. It is not a guarantee. Review the folder before installing.
What licence does Formal Methods Reconciler use?
No licence was found for Formal Methods Reconciler or its repository. Without one, default copyright applies: ask the author before reusing or redistributing it.
How many tokens does Formal Methods Reconciler use?
About 1.9k tokens (SKILL.md is roughly 7.7k characters). Agents keep only the skill's name and description in context until a task matches; then they load SKILL.md in full. Its references folder adds about 3.4k tokens, read only when the agent opens those files.
What are the alternatives to Formal Methods Reconciler?
Skills that share tags, products or a category with Formal Methods Reconciler: Spec Writer (garrytan/gstack, 136k stars), Spec (garden-co/classic-jazz, 2.5k stars), Spec Driven Workflow (alirezarezvani/claude-skills, 28k stars) and Sparc Spec (ruvnet/ruflo, 74k stars). The comparison table on this page puts their stars, adoption, token cost, safety result and licence side by side.
Who maintains Formal Methods Reconciler?
mizchi (a GitHub user) maintains it in mizchi/skills, which has 360 GitHub stars. The repository holds 69 skills in this directory. The repository was last updated on October 2, 2026.
Source: mizchi/skills on GitHub. Facts on this page come from the repository at the commit we read; the author's words are quoted as theirs.