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🌟 Release Highlights

This release focuses on workflow parameterization for workflow_call reuse, automatic service container access, and a strong set of community-driven bug fixes and features.

✨ What's New

  • Expression parameterization for workflow_call — Multiple frontmatter fields now accept GitHub Actions expressions, enabling reusable workflows to customize behavior at call time:
  • timeout-minutes: $\{\{ inputs.timeout }}
  • engine.version: $\{\{ inputs.engine-version }}

  • tools.timeout, tools.startup-timeout, and tools.playwright.version

  • Auto-generate --allow-host-service-ports from services: mappings — Workflows using GitHub Actions service containers (PostgreSQL, Redis, etc.) no longer need manual port configuration. The compiler now extracts declared port mappings and emits runtime $\{\{ job.services.<name>.ports['<port>'] }} expressions automatically, so agents can reach service containers out of the box.

  • Step templating support — Workflows can now use templating patterns for steps, enabling more expressive and reusable workflow definitions.

  • Restrict Copilot CLI built-in tools via frontmatter — Fine-grained control over which Copilot CLI built-in tools are available to agents in a workflow.

  • Discussion post commenting and editing — Workflows can now comment on and edit posts within GitHub Discussions, expanding discussion interaction capabilities.

🐛 Bug Fixes & Improvements

  • Cross-repo org ruleset timestamp check fixed — The "Check workflow file timestamps" step no longer fails with ERR_CONFIG when workflows run cross-repo via organization rulesets.
  • <safe-output-tools> prompt expression inlining resolved — Compiled prompts no longer inline $\{\{ }} expressions verbatim, which was re-triggering the expression-size limit.
  • create-code-scanning-alert safe-output fixed — The code scanning alert safe-output handler now works correctly for all supported alert configurations.
  • Cross-repo import path resolution corrected — gh aw add no longer rewrites \{\\{\#import shared/X.md}} with an incorrect path; imports now resolve from .github/workflows/ as expected.
  • Audit tool: Codex metrics and firewall root cause — gh aw audit now surfaces token/turn metrics and firewall-blocked domain root causes for failed Codex runs.

📚 Documentation

  • New "Supported Languages & Ecosystems" reference page — A dedicated reference mapping popular languages (Python, Go, Java, Rust, TypeScript, etc.) to their ecosystem identifiers, package managers, and configuration examples. Learn more

⚡ Dependency Updates

  • Playwright v1.59.0 — New Screencast API (page.screencast), Browser Interoperability (browser.bind()), Observability Dashboard, and CLI debugger for agents.
  • MCP Gateway v0.2.11 — WASM guard startup time reduced (wazero compilation cache), accurate /health endpoint, embedded config schema.
  • Playwright MCP v0.0.70 — Tracks Playwright v1.59.0.

🌍 Community Contributions

A huge thank you to the community members who reported issues that were resolved in this release! ### `@corygehr` - [Request: Allow commenting, editing posts within a Discussion](https://github.com/github/gh-aw/issues/23753) _(direct issue)_ ### `@deyaaeldeen` - [Feature: allow restricting Copilot CLI built-in tools via frontmatter](https://github.com/github/gh-aw/issues/23198) _(direct issue)_ ### `@ericstj` - [Feature request: allow for templating of steps](https://github.com/github/gh-aw/issues/23766) _(direct issue)_ ### `@jaroslawgajewski` - ["Check workflow file timestamps" step fails with ERR_CONFIG when workflow runs cross-repo via org rulesets](https://github.com/github/gh-aw/issues/23779) _(direct issue)_ ### `@johnpreed` - [gh aw add rewrites \{\\{\#import shared/X.md}} with incorrect cross-repo path (resolves from repo root instead of .github/workflows/)](https://github.com/github/gh-aw/issues/23212) _(direct issue)_ ### `@kbreit-insight` - [create-code-scanning-alert safe-output doesn't seem to work as it should](https://github.com/github/gh-aw/issues/23725) _(direct issue)_ ### `@strawgate` - [Compiled \(safe-output-tools\) prompt inlines $\{\{ }} expressions, re-triggering expression-size limit](https://github.com/github/gh-aw/issues/23768) _(direct issue)_

For complete details, see CHANGELOG.

Generated by Release

What's Changed

Full Changelog: https://github.com/github/gh-aw/compare/v0.65.3...v0.65.4

Source: README.md, updated 2026-04-01