extend-new-code SKILL.md skillA
extend-new-code from qutone/lightstim is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add qutone/lightstim/extend-new-code@git:20260526.75df926Pins git:20260526.75df926 in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- qutone/lightstim
- Path
skills/extend-new-code/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260526.75df926, committed May 26, 2026
- First version recorded
- May 14, 2026
- Size
- 7,392 bytes
- Repository stars
- 50
- License
- a license file GitHub does not identify
Add a new QEC code to LightStim by implementing QECPatch and a syndrome extraction block. Use this skill whenever the user asks to implement a new quantum error correcting code, extend LightStim with a custom code family, define stabilizers and logical operators for a new code, create a new SE_block, or understand the minimal interface a code needs to satisfy.
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Extend with a New QEC Code
Every LightStim code requires two classes:
1. **`QECPatch` subclass** — geometry (qubit positions) + physics (stabilizers + logicals)
2. **Extraction block** — builds one noiseless SE round as a `stim.Circuit`
## Part 1: `QECPatch` subclass
### The three build phases
```python
from lightstim.ir.qec_patch import QECPatch
class MyCode(QECPatch):
def _process_params(self):
self.distance = self.params['distance'] # validate params here
def build(self):
d = self.distance
# Phase 1: geometry — register every qubit at its (x, y) coordinate
self.add_qubit(x, y, role='data') # data qubit
self.add_qubit(x, y, role='syndrome_z') # Z-ancilla
self.add_qubit(x, y, role='syndrome_x') # X-ancilla
# Phase 2: physics — one stabilizer per ancilla
# target_dict: {(x, y): 'X'|'Z'|'Y'} for each data qubit in the stabilizer support
self.create_stim_stabilizer(
target_dict={(x1, y1): 'Z', (x2, y2): 'Z'},
syn_coord=(sx, sy), # coordinate of the ancilla qubit
type='Z', # 'X' or 'Z' (or 'Mixed' for YY etc.)
)
…Read the whole file at its exact version.
How to install
mdr add qutone/lightstim/extend-new-code@sha256:c893d0ab1ac25cb1The line at the top of this page pins the label git:20260526.75df926, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_qhxxb33vbbm454wb)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between May 14, 2026 and May 26, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260526.75df926 latest | 2026-05-26 | 75df926 | 7,392 B | A | view · diff |
| git:20260526.5b92aea | 2026-05-26 | 5b92aea | 7,313 B | A | view · diff |
| git:20260514.9fcb9fa | 2026-05-14 | 9fcb9fa | 2,818 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (7392 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
qutone/lightstim · 50 stars · license a license file GitHub does not identify · pushed 2026-10-29 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_qhxxb33vbbm454wb GET https://markdownregistry.com/api/v1/resolve?ref=qutone/lightstim/extend-new-code GET https://markdownregistry.com/api/v1/blob/c893d0ab1ac25cb17b7a7dab10e5ff4825f2c233114207c73004d83776beeff6
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Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.