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agents(rules): add manual tag rule and frontmatter to starlark.md #4002

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rickeylev merged 1 commit into from
Aug 5, 2026
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agents(rules): add manual tag rule and frontmatter to starlark.md #4002

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12 changes: 12 additions & 0 deletions .agents/rules/starlark.md
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Original file line number Diff line number Diff line change
@@ -1,3 +1,9 @@
---
trigger: glob
description: Starlark Language, Macro, and Testing Invariants
globs: "*.bzl,BUILD,BUILD.bazel,*.bazel"
---

# Starlark Language & Macro Invariants

## Macro Target Canonicalization
Expand All @@ -7,6 +13,12 @@
* Note that `python/private/common_labels.bzl` defines `labels`, a struct
containing common canonicalized label strings used across the project.

## Manual Tag on Internal Macro Helper Targets
* When macros instantiate internal helper targets (such as private rule targets
for artifact extraction or linking support), always include `tags = ["manual"]`.
* **Why**: This prevents internal helper targets from being implicitly built when
wildcard target patterns (e.g., `//...`) are expanded.

## Private Alias Pattern when Appending to User `deps`
* When macros append internal helper targets to user-provided dependency lists
(`deps`), use private alias targets (e.g.
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