CoR: Migrate to "Copilot" harness (update MCP; fix autopilot, model & custom agent carryover)

[Matthew Fisher (MicroFish91)]

VS Code will be migrating to the "Copilot" harness as the default, this ensures Copilot on Rails doesn't break when that happens.

[Copilot]

Copilot review overview

🟡 Changes recommended

The scaffold handoff remains inconsistent, and the new drift validation rejects every current agent manifest.

Review effort: Balanced
Findings: 1 · 1

Open (2)

• Agent manifest allowlists conflict with scoped tool contract · New
• Top-level scaffold agent still passes invalid prompt argument · New

What changed in this PR

Migrates Copilot on Rails to VS Code’s Copilot harness while preserving agent, model, and Autopilot state across phase handoffs.

Changes:

• Enables the Copilot harness and TCP MCP transport.
• Adds Agent Host model resolution and Autopilot propagation.
• Updates agent aliases, tests, contracts, dependencies, and documentation.

Screenshots: None; no visual UI changed.

File	Description
test/​copilotOnRails/​openChatWithAgent.test.ts	Tests agent launch options and Autopilot markers.
test/​copilotOnRails/​modelSelection.test.ts	Tests Agent Host model mapping.
test/​copilotOnRails/​autopilot.test.ts	Tests Agent Host Autopilot configuration.
src/​webviews/​copilotOnRails/​extension/​harnessSettings.ts	Enables the Copilot harness.
src/​webviews/​copilotOnRails/​extension/​autopilot.ts	Configures and restores Agent Host Autopilot.
src/​utils/​copilotOnRails/​modelSelection.ts	Resolves harness-compatible models.
src/​extension.ts	Enables eager TCP MCP startup.
src/​commands/​copilotOnRails/​openChatWithAgent.ts	Updates custom-agent launch sequencing.
resources/​agents/​azure-project-scaffold/​instructions.md	Revises unattended integration handoff.
resources/​agents/​azure-project-scaffold.agent.md	Adds harness tool aliases.
resources/​agents/​azure-project-plan.agent.md	Adds harness tool aliases.
resources/​agents/​azure-project-integrate.agent.md	Adds harness tool aliases.
resources/​agents/​azure-deploy.agent.md	Adds harness tool aliases.
resources/​agents/​azure-debug-plan.agent.md	Adds harness tool aliases.
resources/​agents/​azure-debug-generate.agent.md	Adds harness tool aliases.
package.json	Updates MCP and test dependencies.
package-lock.json	Locks updated dependencies.
evals/​check-agent-drift.ts	Adds agent-tool and handoff contracts.
evals/​agent-assets.lock.json	Refreshes agent asset hashes.
docs/​copilot-create-project.md	Documents harness behavior and state.

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[github-actions]

CoR debug generation review

These are general recommendations. Treat them as suggestions, not rules that
every change must follow.

Verdict: PASS
Reviewed head: b9d0998
Compared base: 8a381e8

The scoped change only expands the custom agent's tool declarations for harness-compatible names and does not alter instruction ownership or workflow composition.

Findings

None.

Coverage

Inspected scoped file: resources/agents/azure-debug-generate.agent.md. No files under resources/agents/azure-debug-generate/ changed; the unchanged internal instructions were inspected as composition context.

Criterion	Result	Reason
AR-01	Pass	Tool availability remains owned by the custom-agent frontmatter; no workflow responsibility moved.
AR-02	Pass	The added aliases do not redefine commands, artifacts, ports, readiness, or lifecycle behavior.
AR-03	Not applicable	Internal workflow coordination is unchanged.
AR-04	Not applicable	Reference selection, ordering, output ownership, and conflict handling are unchanged.
AR-05	Not applicable	No shared or implementation-specific workflow behavior changed.
AR-06	Not applicable	No shared module was added or changed.
AR-07	Pass	The declaration change introduces no orchestrator-specific behavior or generated-file changes.
AR-08	Not applicable	No category entry, template, section, or ownership structure changed.

This is a static instruction review, not a successful F5 or end-to-end test.
After pushing fixes, someone with write, maintain, or admin access to the base
repository can post a new PR comment starting with /cor-debug-generate-review
to request another review.

Generated by CoR Azure Debug Generate Review for #1939 · copilot · gpt56 · 32.7 AIC · ⌖ 12.2 AIC · ⊞ 24.4K
_{Comment /cor-debug-generate-review to run again}