pi-lens-write-tree-sitter-rule SKILL.md skillA
pi-lens-write-tree-sitter-rule from apmantza/pi-lens is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add apmantza/pi-lens/pi-lens-write-tree-sitter-rule@git:20260815.4cc6eedPins git:20260815.4cc6eed in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- apmantza/pi-lens
- Path
skills/pi-lens-write-tree-sitter-rule/SKILL.md- Versions recorded
- 3
- Latest version
- git:20260815.4cc6eed, committed Aug 15, 2026
- First version recorded
- Jul 11, 2026
- Size
- 4,837 bytes
- Repository stars
- 480
- License
- MIT
Use when writing a new pi-lens tree-sitter query rule YAML file — covers schema, S-expression syntax, capture names, predicates, and gotchas.
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
# Writing a pi-lens tree-sitter Rule
Drop path: `rules/tree-sitter-queries/<language>/<id>.yml`
Language dir is **lowercase**: `typescript` `javascript` `tsx` `python` `go` `rust` `java` `csharp` `kotlin` `php` `ruby` `cpp` `c` `css`
Project rules merge with built-ins (both run). To disable a language's built-ins: rename dir to `<lang>-disabled/`.
## Minimal template
```yaml
id: no-eval
severity: error
inline_tier: blocking # blocking | warning | review
language: typescript # lowercase, inferred from dir if omitted
message: "eval() is dangerous — use a safer alternative"
query: |
(call_expression
function: (identifier) @FN
(#eq? @FN "eval"))
metavars: [FN]
has_fix: false
```
## S-expression query syntax
```scheme
; Node with field
(call_expression
function: (identifier) @NAME
arguments: (arguments) @ARGS)
; Alternatives — ALL branches must use the SAME capture names
[
(function_declaration name: (identifier) @FN)
(arrow_function) @FN
]
; Predicates (inline)
(#eq? @NAME "fetch") ; exact match
(#match? @NAME "^on[A-Z]") ; regex match
```
## Predicates via YAML (faster — runs in WASM)
```yaml
predicates:
…Read the whole file at its exact version.
How to install
mdr add apmantza/pi-lens/pi-lens-write-tree-sitter-rule@sha256:a02cc831dd0c82ddThe line at the top of this page pins the label git:20260815.4cc6eed, 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_iipqltpxbiwpmhob)
3 badge image fetches in 30 days. What the badge shows.
Versions
The registry has recorded 3 versions of this file, between Jul 11, 2026 and Aug 15, 2026, about one every 17 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260815.4cc6eed latest | 2026-08-15 | 4cc6eed | 4,837 B | A | view · diff |
| git:20260729.bfc6213 | 2026-07-29 | bfc6213 | 4,709 B | A | view · diff |
| git:20260711.a8583f1 | 2026-07-11 | a8583f1 | 4,388 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 (4837 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
apmantza/pi-lens · 480 stars · license MIT · pushed 2026-10-21 · branch master
API
GET https://markdownregistry.com/api/v1/artifacts/art_iipqltpxbiwpmhob GET https://markdownregistry.com/api/v1/resolve?ref=apmantza/pi-lens/pi-lens-write-tree-sitter-rule GET https://markdownregistry.com/api/v1/blob/a02cc831dd0c82dd402e153a8f0bfaeedf915b88e5d04f63dc3b2a63ae3028f5
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
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.