Release v1.5.0

Release v1.5.0

• Extension system with a LangChain template. agents-cli can now be extended with custom commands and add-on agent templates, shipped with a LangChain extension and authoring guides. Extensions install from GitHub, other git hosts (including self-hosted and enterprise servers), or a local path for development.
• Add agents-cli infra show to inspect the Terraform configuration provisioned by agents-cli infra single-project.
• Add --update-only to agents-cli deploy, so a deploy updates an existing Agent Runtime engine instead of creating a duplicate.
• Add a --labels flag to agents-cli deploy to tag Agent Runtime and Cloud Run deployments.
• Add --qps to agents-cli eval that controls the request rate instead of being throttled to the default value.
• Name the scaffolded root agent after its project instead of a generic default.
• agents-cli deploy now retries throttled Agent Platform calls.
• agents-cli create now reports precondition failures as clear errors instead of exiting successfully or printing a traceback.
  • #68
• Fix background server reuse ignoring the requested session mode.
  • #70
• Fix reasoning_engine_adapter streaming returning an empty response.
  • #80
• Prevent multi-region deployments in scaffold and deploy.
  • #81
• Give a clear error for malformed project manifests instead of silently defaulting or printing a traceback.
  • #74
• Fix stale command references in docs and CLI hints.
  • #77
• Scaffolded A2A agents now forward tool calls and responses to clients, not just text.
• agents-cli setup now works without network or git access, with skills bundled into the package.
• Fix a Windows failure loading a scaffolded project whose config points at a local path.