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New Support for Subagents

  • Copilot will eventually support agents: in custom agent files, this will make subagents behave consistently and better more often.
  • It will also allow for reusing subagents with other agents.
  • Additionally #tool: will allow for better support at referring to the tool names that Copilot uses, in the agent files themselves.

These features are not yet implemented in GitHub Copilot, when supported then I'll continue working on this change.

…d execution mode detection

- update description for clarity and detail
- refine execution mode detection section for better understanding
- improve structured findings format for subagents
- streamline phase validation and final validation phase instructions

🔧 - Generated by Copilot
…gent dispatch

- replace runSubagent references with #tool:agent in multiple prompt files
- clarify subagent dispatch instructions for improved consistency
- enhance documentation for prompt engineering workflows

🔧 - Generated by Copilot
…, and updating

- implement prompt-builder-evaluator for quality assessment
- create prompt-builder-executor for testing prompt clarity
- introduce prompt-builder-updater for modifying prompt artifacts
- enhance prompt-builder with improved orchestration of subagents

🔧 - Generated by Copilot
…nd improve clarity

🔍 - Generated by Copilot
Copilot AI review requested due to automatic review settings February 12, 2026 03:20
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Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 76.22%. Comparing base (8133b36) to head (16483c9).

Additional details and impacted files

Impacted file tree graph

@@           Coverage Diff           @@
##             main     #484   +/-   ##
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  Coverage   76.22%   76.22%           
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  Files          20       20           
  Lines        3503     3503           
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  Hits         2670     2670           
  Misses        833      833           
Flag Coverage Δ
pester 76.22% <ø> (ø)

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see 1 file with indirect coverage changes

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Pull request overview

This PR updates the repo’s prompt/agent authoring guidance and artifacts to prepare for improved subagent orchestration (executor/evaluator/updater pattern) and tool referencing, plus expands the workspace MCP server configuration.

Changes:

  • Expands .vscode/mcp.json with additional MCP servers and ADO-related inputs.
  • Simplifies several prompt files to delegate more behavior to the prompt-builder agent and introduces new “leaf” subagent agent files.
  • Updates prompt-builder.instructions.md and the prompt-builder / task-planner agents to reflect the new subagent model and streamlined protocols.

Reviewed changes

Copilot reviewed 11 out of 11 changed files in this pull request and generated 13 comments.

Show a summary per file
File Description
.vscode/mcp.json Adds MCP inputs/servers, but currently introduces JSON validity issues and an incomplete server definition
.github/prompts/task-plan.prompt.md Adds argument hint and tweaks planning step flow
.github/prompts/prompt-refactor.prompt.md Refactors prompt to be more mode-driven, but has input/argument hint mismatch
.github/prompts/prompt-build.prompt.md Refactors prompt to be more mode-driven, but has input/argument hint mismatch
.github/prompts/prompt-analyze.prompt.md Simplifies analysis prompt and delegates to prompt-builder agent
.github/instructions/prompt-builder.instructions.md Updates authoring standards and documents new agent frontmatter fields (currently out of sync with schema)
.github/agents/task-planner.agent.md Updates wording, adds clearer phase transitions, compresses template guidance
.github/agents/prompt-builder.agent.md Introduces orchestrator-style agent with subagent list (currently schema-incompatible)
.github/agents/prompt-builder-updater.agent.md Adds updater “leaf” agent (currently schema-incompatible frontmatter)
.github/agents/prompt-builder-executor.agent.md Adds executor “leaf” agent (currently schema-incompatible frontmatter)
.github/agents/prompt-builder-evaluator.agent.md Adds evaluator “leaf” agent (currently schema-incompatible frontmatter)

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2 participants