Issue Monster: Create shared feature PR for sub-issue batches

[Copilot]

Issue Monster now creates a single feature PR for all sub-issues of a parent task, rather than blocking sibling processing until each PR completes. This enables parallel assignment while accumulating changes in one branch.

Changes

• Extended assign_to_agent validation: Added optional branch field (string, max 256 chars, sanitized)

• Issue Monster workflow behavior:

  • First sub-issue: Creates empty PR with allow-empty: true, description contains "Pull request for #[parent_issue_number]" marker
  • Subsequent sub-issues: Searches for existing PR via marker text, assigns agent (GitHub Copilot auto-discovers linked PR)
  • All siblings accumulate work in shared feature PR

• Removed sibling blocking: Section 1a now searches for feature PR instead of blocking on sibling PRs; section 2 no longer checks sibling assignments

Example

Parent issue #100 has sub-issues #101, #102, #103:

# First run processes #101
create_pull_request(
  title="Feature: Implement user auth",
  body="Pull request for #100\n\nRelated to #101",  # Marker enables PR discovery
  branch="feature/issue-100"
)
assign_to_agent(issue_number=101, agent="copilot")

# Next run processes #102 - finds existing PR, no creation needed
assign_to_agent(issue_number=102, agent="copilot")  # Works in same branch

Result: One PR accumulates all sub-issue changes instead of sequential blocking.

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:

• https://api.github.com/user
  • Triggering command: /usr/bin/gh gh api user --jq .login /tmp/validate-js-3479104976.cjs ache/go/1.25.0/x64/pkg/tool/linux_amd64/vet ache/go/1.25.0/x64/pkg/tool/linux_amd64/compile se 4331507/b037/vetrev-parse 64/pkg/tool/linu--show-toplevel ache/go/1.25.0/x64/pkg/tool/linux_amd64/compile -c e-github-app-token.git e-github-app-token.git ine se 4331507/b213/vettest.js ache/go/1.25.0/x64/pkg/tool/linu--show-toplevel ine (http block)
  • Triggering command: /usr/bin/gh gh api user --jq .login up-uv.git up-uv.git (http block)
  • Triggering command: /usr/bin/gh gh api user --jq .login s/ ache/go/1.25.0/xremote.origin.ur--log-format deb50ff7f89340dc955fb6080c101953abd/log.json tags/v6 4331507/b233/vet-c (http 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

Update Issue Monster agentic workflow in tbe following way:

• when it starts to assigns the FIRST sub issue to the agent, it should create an empty pull requests to host the feature work (using create-pull-request + allow-empty), then use the pull request branch when assigning each sub issue to the agent. To remember that there is a pull request tied to the issue, it make sure that the pull request description contains a keywork "pull request for #xxx" so that this text can be searched in future runs
• when it processes a sub issue that is not the first, it should search for an open PR with the marker and use that branch if found

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