Fix: Honor deprecated infer: false in custom agent visibility

[Copilot]

Custom agents with infer: false in their frontmatter were still being invocable by the model. The deprecated infer attribute (superseded by user-invocable/disable-model-invocation) was not correctly taken into account when computing agentInvocable.

Root Cause

// Before — infer:false with no disableModelInvocation set → false || true → true (bug)
agentInvocable: ast.header.infer === true || ast.header.disableModelInvocation !== true,

// After — check infer first; fall back to disableModelInvocation only when infer is absent
agentInvocable: ast.header.infer !== undefined ? ast.header.infer === true : ast.header.disableModelInvocation !== true,

Changes

• promptsServiceImpl.ts: Fix agentInvocable calculation to give infer precedence over disableModelInvocation when explicitly set.
• promptsService.test.ts: Add getCustomAgents test covering infer: false → agentInvocable: false, infer: true → agentInvocable: true, and missing infer → defaults to true.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• redirector.gvt1.com
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --enable-crash-reporter=c9f7a3bd-4b22-4038-b438-f01468dc4c67,no_channel --user-data-dir=/tmp/vscode-tests-1771860075298 --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,8710832619931435156,5229929586332296513,262144 --enable-features=PdfUseShowSaveFilePicker --disable-features=LocalNetworkAccessChecks,ScreenAIOCREnabled,SpareRendererForSitePerProcess,TraceSiteInstanceGetProcessCreation --variations-seed-version --trace-process-track-uuid=3190708989122997041 (dns block)
  • Triggering command: /home/REDACTED/work/vscode/vscode/.build/electron/code-oss /home/REDACTED/work/vscode/vscode/.build/electron/code-oss --no-sandbox /home/REDACTED/work/vscode/vscode/test/unit/electron/index.js --run src/vs/workbench/contrib/chat/test/common/promptSyntax/service/promptsService.test.ts --grep infer: false (dns block)
  • Triggering command: /proc/self/exe /proc/self/exe --type=utility --utility-sub-type=network.mojom.NetworkService --lang=en-US --service-sandbox-type=none --no-sandbox --enable-crash-reporter=25a6f598-a8b1-44e8-b554-b108c7c3b754,no_channel --user-data-dir=/tmp/vscode-tests-1771860267998 --shared-files=v8_context_snapshot_data:100 --field-trial-handle=3,i,10874546582333780572,11522497578564019318,262144 --enable-features=PdfUseShowSaveFilePicker --disable-features=LocalNetworkAccessChecks,ScreenAIOCREnabled,SpareRendererForSitePerProcess,TraceSiteInstanceGetProcessCreation --variations-seed-version --trace-process-track-uuid=3190708989122997041 --project bin/sh ces false ode-gyp-bin/sh node (dns block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Custom agent with infer: false is still invoked as the deprecated setting isn't honored</issue_title>
<issue_description>1. Have a custom agent with infer: false
2. Ask agent to invoke it
3. 🐛 Agent will invoke the custom agent

Since infer shipped during GH Universe, I'd expect that it still works even when deprecated.</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Custom agent with infer: false is still invoked as the deprecated setting isn't honored #294003

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