feat: fleet.sh assigns issues to containers for parallel isolation (HdrHistogram#121)

* feat: fleet.sh assigns issues to containers for parallel isolation

fleet.sh now fetches available issues upfront and launches one container
per issue with ISSUE_NUMBER env var, preventing duplicate work.
agent-loop.sh pick-issue honours pre-assigned issue when set.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: address PR review feedback

- Use GH_TOKEN_UPSTREAM for gh issue view in pre-assigned path
- Use 'add // []' in jq merge to guard against null

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

* fix: sort issues oldest-first in fleet.sh

gh issue list defaults to newest-first. Add --search "sort:created-asc"
so the fleet processes the oldest issues first.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

Author: LeeCampbell

.devcontainer/agent-loop.sh

@@ -145,23 +145,31 @@ Closes #${ISSUE_NUM}"
         ;;
 
     pick-issue)
-        ISSUE_JSON=$(gh issue list --assignee @me --state open \
-            --repo "$UPSTREAM_REPO" \
-            --json number,title --limit 1 2>/dev/null || echo "[]")
-
-        if [ "$ISSUE_JSON" = "[]" ] || [ "$ISSUE_JSON" = "" ]; then
-            ISSUE_JSON=$(gh issue list --label agent --state open \
+        if [ -n "${ISSUE_NUMBER:-}" ]; then
+            # Issue pre-assigned by fleet.sh
+            ISSUE_NUM="$ISSUE_NUMBER"
+            ISSUE_TITLE=$(GH_TOKEN="$GH_TOKEN_UPSTREAM" gh issue view "$ISSUE_NUM" \
+                --repo "$UPSTREAM_REPO" --json title --jq .title)
+        else
+            # Self-select: assigned first, then labelled 'agent'
+            ISSUE_JSON=$(gh issue list --assignee @me --state open \
                 --repo "$UPSTREAM_REPO" \
                 --json number,title --limit 1 2>/dev/null || echo "[]")
-        fi
 
-        ISSUE_NUM=$(echo "$ISSUE_JSON" | jq -r '.[0].number // empty')
-        if [ -z "$ISSUE_NUM" ]; then
-            echo "No work available."
-            exit 0
-        fi
+            if [ "$ISSUE_JSON" = "[]" ] || [ "$ISSUE_JSON" = "" ]; then
+                ISSUE_JSON=$(gh issue list --label agent --state open \
+                    --repo "$UPSTREAM_REPO" \
+                    --json number,title --limit 1 2>/dev/null || echo "[]")
+            fi
+
+            ISSUE_NUM=$(echo "$ISSUE_JSON" | jq -r '.[0].number // empty')
+            if [ -z "$ISSUE_NUM" ]; then
+                echo "No work available."
+                exit 0
+            fi
 
-        ISSUE_TITLE=$(echo "$ISSUE_JSON" | jq -r '.[0].title')
+            ISSUE_TITLE=$(echo "$ISSUE_JSON" | jq -r '.[0].title')
+        fi
         BRANCH_SLUG=$(echo "$ISSUE_TITLE" | tr '[:upper:]' '[:lower:]' | \
             sed 's/[^a-z0-9]/-/g' | sed 's/--*/-/g' | head -c 40)
 

.devcontainer/fleet.sh

@@ -1,5 +1,5 @@
 #!/bin/bash
-# fleet.sh — Spin up N agents, each assigned a different issue
+# fleet.sh — Fetch available issues and spin up one agent per issue
 set -euo pipefail
 
 FLEET_SIZE="${1:-3}"
@@ -9,11 +9,43 @@ source "$SCRIPT_DIR/.env"
 # Build the image
 docker build -t hdrhistogram-agent -f "$SCRIPT_DIR/Dockerfile" "$SCRIPT_DIR/"
 
-echo "Launching $FLEET_SIZE agents..."
+# Fetch available issues (assigned to agent first, then labelled 'agent')
+ISSUES=$(GH_TOKEN="$GH_TOKEN_UPSTREAM" gh issue list --assignee "$GIT_USER_NAME" --state open \
+    --repo "$UPSTREAM_REPO" --json number,title --limit "$FLEET_SIZE" \
+    --search "sort:created-asc" 2>/dev/null || echo "[]")
 
-for i in $(seq 1 "$FLEET_SIZE"); do
-    AGENT_NAME="hdrhistogram-agent-$i"
-    echo "Starting $AGENT_NAME..."
+ISSUE_COUNT=$(echo "$ISSUES" | jq 'length')
+
+if [ "$ISSUE_COUNT" -lt "$FLEET_SIZE" ]; then
+    REMAINING=$((FLEET_SIZE - ISSUE_COUNT))
+    ASSIGNED_NUMS=$(echo "$ISSUES" | jq -r '.[].number')
+
+    EXTRA=$(GH_TOKEN="$GH_TOKEN_UPSTREAM" gh issue list --label agent --state open \
+        --repo "$UPSTREAM_REPO" --json number,title --limit "$REMAINING" \
+        --search "sort:created-asc" 2>/dev/null || echo "[]")
+
+    # Filter out any already-assigned issues
+    for num in $ASSIGNED_NUMS; do
+        EXTRA=$(echo "$EXTRA" | jq --argjson n "$num" '[.[] | select(.number != $n)]')
+    done
+
+    ISSUES=$(echo "$ISSUES $EXTRA" | jq -s 'add // []')
+fi
+
+ISSUE_COUNT=$(echo "$ISSUES" | jq 'length')
+if [ "$ISSUE_COUNT" -eq 0 ]; then
+    echo "No issues available."
+    exit 0
+fi
+
+echo "Found $ISSUE_COUNT issue(s). Launching agents..."
+
+for i in $(seq 0 $((ISSUE_COUNT - 1))); do
+    ISSUE_NUM=$(echo "$ISSUES" | jq -r ".[$i].number")
+    ISSUE_TITLE=$(echo "$ISSUES" | jq -r ".[$i].title")
+    AGENT_NAME="hdrhistogram-agent-${ISSUE_NUM}"
+
+    echo "Starting $AGENT_NAME for issue #${ISSUE_NUM}: ${ISSUE_TITLE}"
 
     docker run -d --rm \
         --name "$AGENT_NAME" \
@@ -22,10 +54,12 @@ for i in $(seq 1 "$FLEET_SIZE"); do
         --memory=4g \
         --cpus=2 \
         --env-file "$SCRIPT_DIR/.env" \
-        -e MAX_ITERATIONS=15 \
+        -e ISSUE_NUMBER="$ISSUE_NUM" \
+        -e MAX_ITERATIONS=50 \
         -v nuget-cache:/home/agent/.nuget/packages \
         hdrhistogram-agent
 done
 
+echo ""
 echo "Fleet launched. Monitor with: docker ps --filter name=hdrhistogram-agent"
-echo "Logs: docker logs -f hdrhistogram-agent-1"
+echo "Logs: docker logs -f hdrhistogram-agent-<issue-number>"