[Agents Extension] Post deploy print update

[trangevi]

Fixes #7942

Update the print to show the endpoint a user would use to invoke the agent.

[github-actions]

📋 Prioritization Note

Thanks for the contribution! The linked issue isn't in the current milestone yet.
Review may take a bit longer — reach out to @rajeshkamal5050 or @kristenwomack if you'd like to discuss prioritization.

[Copilot]

Pull request overview

Updates the Azure AI Agents extension deploy output to display invocation-ready agent endpoints (per protocol) instead of the agent version URL, aligning post-deploy guidance with how users actually call the agent.

Changes:

• Introduces per-protocol invocation endpoint construction (responses / invocations) and uses it for deploy artifacts and env var registration.
• Updates Endpoints() to return protocol-specific endpoint env vars rather than a single version endpoint.
• Adds unit tests covering protocol path mapping, endpoint construction, and deploy artifact labeling/note behavior.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 7 comments.

File	Description
cli/azd/extensions/azure.ai.agents/internal/project/service_target_agent.go	Builds and surfaces per-protocol invocation endpoints; updates env var registration and endpoint reporting.
cli/azd/extensions/azure.ai.agents/internal/project/service_target_agent_test.go	Adds tests validating protocol filtering/mapping and deploy artifact endpoint formatting.

[jongio]

Clean approach to switching from version URLs to per-protocol invocation URLs. A few things:

1. CI blocker: gofmt is failing - mixed tabs/spaces in the deployHostedAgent area (see inline).
2. Endpoints() lost its validation that previously gave users a helpful error when env vars were not set. Now silently returns empty (see inline).
3. The deployHostedAgent doc comment was removed - worth restoring.
4. No test coverage for the updated Endpoints() or registerAgentEnvironmentVariables methods. The new helper functions have good tests, but the integration points that call them do not.

[wbreza]

Code Review — PR #7974

Nice work on the per-protocol endpoint refactor, Travis! The approach is clean and the test coverage for the new helpers is solid. A few items to consider:

P1 — Should Fix

1. Protocol list duplication between Endpoints() and protocolPath()
Endpoints() hardcodes ["RESPONSES", "INVOCATIONS"] (line ~238) while protocolPath() maintains its own switch (line ~777). These must stay in sync manually — adding a new protocol requires changes in both places with no compiler safety net.

Consider extracting a shared constant or deriving the env var suffix from protocol constants so there's a single source of truth.

2. Stale AGENT_{KEY}_ENDPOINT env var not cleaned on upgrade
The old single-endpoint env var (AGENT_{KEY}_ENDPOINT) will persist in existing azd environments after re-deploy, alongside the new per-protocol vars (AGENT_{KEY}_RESPONSES_ENDPOINT, etc.). Downstream consumers (hooks, scripts) reading the old var will get a stale URL.

Consider deleting the legacy key in registerAgentEnvironmentVariables().

3. Endpoints() returns empty slice silently
If neither AGENT_{KEY}_RESPONSES_ENDPOINT nor AGENT_{KEY}_INVOCATIONS_ENDPOINT is set, Endpoints() returns nil, nil. Callers can't distinguish "no protocols configured" from "something went wrong." Consider adding a debug-level log when no endpoints are found after deploy.

P2 — Consider Fixing

• Missing unit test for registerAgentEnvironmentVariables with per-protocol env vars — would catch regressions in key formatting.
• Missing edge case test for nil protocols slice (vs empty slice) in TestAgentInvocationEndpoints.
• Deleted Godoc comment on deployHostedAgent (line ~603) — looks accidental; consider restoring.

[jongio]

Addresses all my previous feedback. The displayableProtocols extraction is cleaner than what I suggested - single source of truth for both Endpoints() and protocolPath(). Legacy env var cleanup and default protocol fallback are good additions. CI is green.

[wbreza]

Code Review — PR #7974 (Re-review)

All previously raised items have been addressed cleanly:

• ✅ Protocol list duplication → shared displayableProtocols constant introduced
• ✅ Stale env var cleanup → legacy AGENT_{KEY}_ENDPOINT now explicitly cleared
• ✅ Silent empty endpoints → proper �xterrors.Dependency error with user guidance
• ✅ Test coverage → TestRegisterAgentEnvironmentVariables, nil edge cases added
• ✅ Godoc comment → restored and improved on deployHostedAgent

Nice turnaround, Travis! LGTM.