[docs] Update glossary - daily scan (#19822)

Author: github-actions[bot]

docs/src/content/docs/reference/glossary.md

@@ -137,6 +137,10 @@ A safe output capability for hiding or minimizing GitHub comments without requir
 
 A safe output capability (`assign-to-agent:`) that programmatically assigns the GitHub Copilot coding agent to existing issues or pull requests. Automates the standard GitHub workflow for delegating implementation tasks to Copilot. Supports cross-repository PR creation via `pull-request-repo` and agent model selection via `model`. See [Assign to Copilot](/gh-aw/reference/assign-to-copilot/).
 
+### GH_AW_AGENT_TOKEN
+
+A recognized "magic" repository secret name that GitHub Agentic Workflows automatically uses as a fallback Personal Access Token for `assign-to-agent` operations. When set, no explicit `github-token:` reference is needed in workflow frontmatter — the token is injected automatically. Required because GitHub App installation tokens are rejected by the Copilot assignment API. The token fallback chain is: `assign-to-agent.github-token` → `safe-outputs.github-token` → `GH_AW_AGENT_TOKEN` → `GH_AW_GITHUB_TOKEN` → `GITHUB_TOKEN`. See [Assign to Copilot](/gh-aw/reference/assign-to-copilot/).
+
 ### Custom Safe Outputs
 
 An extension mechanism for safe outputs that enables integration with third-party services beyond built-in GitHub operations. Defined under `safe-outputs.jobs:`, custom safe outputs separate read and write operations: agents use read-only MCP tools for queries, while custom jobs execute write operations with secret access after agent completion. Supports services like Slack, Notion, Jira, or any external API. See [Custom Safe Outputs](/gh-aw/reference/custom-safe-outputs/).
@@ -171,6 +175,10 @@ Natural language schedule syntax that automatically distributes workflow executi
 
 Reusable workflow components shared across multiple workflows. Specified in the `imports:` field, can include tool configurations, common instructions, or security guidelines.
 
+### Label Trigger Shorthand
+
+A compact syntax for label-based triggers: `on: issue labeled bug` or `on: pull_request labeled needs-review`. The compiler expands the shorthand to standard GitHub Actions trigger syntax and automatically includes a `workflow_dispatch` trigger with an `inputs.item_number` parameter, enabling manual dispatch for a specific issue or pull request. Supported for `issue`, `pull_request`, and `discussion` events. See [LabelOps patterns](/gh-aw/patterns/label-ops/).
+
 ### Labels
 
 Optional workflow metadata for categorization and organization. Enables filtering workflows in the CLI using the `--label` flag.