Borrowing it
Nothing to install: this file belongs to punt-labs/z-spec. 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/punt-labs/z-spec/main/CLAUDE.mdgit clone --depth 1 https://github.com/punt-labs/z-specWrote 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/instructions/punt-labs/z-spec/claude-md)<a href="https://agentmods.dev/instructions/punt-labs/z-spec/claude-md"><img src="https://agentmods.dev/badge/instructions/punt-labs/z-spec/claude-md.svg" alt="Measured on agentmods" 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 | $0.01836 | $0.01836 |
| Opus 5 | $0.00918 | $0.00918 |
| Sonnet 5 | $0.00367 | $0.00367 |
| Haiku 4.5 | $0.00184 | $0.00184 |
Grade A, and why
z-spec CLAUDE.md 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 today.
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.
How it starts
The opening of the file, as written. The whole thing — 131 lines — stays where its author put it; the contents beside it link to each section on GitHub.
z-spec
Formal Z specification toolkit: a fuzz/probcli wrapper, an MCP server
(zspec), a CLI (z-spec), and a Claude Code plugin whose skill prompts
guide spec creation, type-checking, and animation. Deterministic work —
parsing, binary wrappers, report I/O, lux rendering — lives in the Python
package; skills call its MCP tools instead of raw bash.
Part of Punt Labs. Must be checked out
inside the punt-labs/ workspace meta-repo so org-wide configuration
(git identity, beads DB, API keys) loads from ../CLAUDE.md and ../.envrc.
- Package:
punt-z-spec(PyPI) - CLI:
z-spec - MCP server:
zspec(stdio;z-spec mcp) - Python: 3.13+, managed with
uv
Architecture
One engine, two thin client surfaces (CLI + MCP), both resolving the same
Command objects from commands/registry.py — tests/commands/test_parity.py
asserts they cannot drift. A command validates inputs, invokes the binary or
store, and returns a CommandResult; it never prints and never knows which
surface called it. display.py is the only module that publishes scenes to
the lux Hub.
Build and test commands
make check # full quality gate: lint, type, test, check-oo,
# check-coupling, check-suppressions, check-dev-commands
make lint # markdownlint + ruff check + ruff format --check + shellcheck
make type # mypy + pyright + fuzz on every examples/*.tex spec
make test # pytest + probcli model-check on every examples/*.tex spec
make uat # build wheel, install CLI, then run the acceptance flight
# by hand — RECONNECT the MCP server after; a reinstall
# does not restart a running stdio server
make check-oo # OO ratchet: must improve over baseline, never regress
make check passing means the code compiles, types hold, unit tests pass,
and every spec type-checks and model-checks. It is necessary, never
sufficient — it says nothing about what a person sees running the CLI,
calling the MCP tool, or clicking the lux menu entry. The verification of
record for every user-facing surface is the feature running in the
installed artifact, exercised by hand against a written-in-advance
expectation, before the PR opens.
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.
- today Changed · -312 lines · -4,181 tokens per session 50c6f2cedcaa
- 8d ago First seen · 443 lines · 6,017 tokens per session scan A 9801cee2bba7
z-spec CLAUDE.md is an instructions file published in the GitHub repository punt-labs/z-spec (5 stars, last pushed today), licensed MIT. It adds 1,836 tokens to every session, about $0.0092 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 2026-08-31.
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