[FEATURE]: Setting Glob-based rules

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I discovered an interesting feature in Google Antigravity IDE.

Users can specify when rules should be triggered, and the glob functionality looks particularly useful.

The rules are stored in Markdown format, and when you specify glob patterns, the rules are only included for matching file types.

The general structure is as follows:

.agent/rules/frontend.md

---
trigger: glob
globs: *.svelte, *.ts
---

frontend rules

.agent/rules/AGENTS.md

---
trigger: always_on
---

main rules

This issue might be a duplicate of existing issues. Please check:

Improve AGENTS.md structure for task-specific instructions and reduced context crowding #1028: Improve AGENTS.md structure for task-specific instructions and reduced context crowding - Discusses conditional loading of instructions based on task context and file patterns
feature request: ability to configure which file will contain agent rules #583: feature request: ability to configure which file will contain agent rules - Related to flexible rule file configuration

Feel free to ignore if none of these address your specific case.

I second this suggestion. Copilot in VS Code has something similar. It uses the folder structure .github/instructions/*.md where the markdown file has an "applyTo" frontmatter section that uses glob matching, then targeted instructions.

Example:

---
applyTo: "internal/**/service/**/*.go"
---

Business logic services MUST:
- depend on interfaces for all external effects
- return concrete result structs + error

The way I understand it works is when a file under edit matches the glob pattern, the custom instructions are automatically injected into the agent instructions that is currently running.

I don't really know if this feature has already been included in opencode yet, but I have found this opencode plugin that does something really similar: https://github.com/frap129/opencode-rules

I would like this functionality to be included into vanilla opencode nonetheless!

this would especially be interesting for monorepos with cascading AGENTS.md (one in the root, one in each package). gh copilot automatically applies cascading agents.md, but making them accessible via instructions on glob-basis would also be a good step forward

Hope we can get this capability to reduce barrier to transition from Github Copilot CLI or Claude Code to OpenCode

Claude Code also provides this feature under the name path specific rules.

For now, the closest workaround I found is to instruct the agent to lazy-load the rules using @ references in AGENTS.md (example).
Note that this is model-driven, not a deterministic extension matcher.

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[FEATURE]: Setting Glob-based rules #4716

Feature hasn't been suggested before.

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.agent/rules/frontend.md

.agent/rules/AGENTS.md

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[FEATURE]: Setting Glob-based rules #4716

Description

Feature hasn't been suggested before.

Describe the enhancement you want to request

.agent/rules/frontend.md

.agent/rules/AGENTS.md

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github-actions commented on Nov 25, 2025

ljosephpratt commented on Jan 13, 2026

doodhout commented on Feb 9, 2026

DerGernTod commented on Mar 13, 2026

aosama commented on Jun 1, 2026

Lingxi-Li commented on Jun 20, 2026

github-actions commented on Aug 20, 2026

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