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+<!-- This prompt will be imported in the agentic workflow .github/workflows/ostrich-benchmark.md at runtime. -->
+<!-- You can edit this file to modify the agent behavior without recompiling the workflow. -->
+
+# Ostrich Benchmark: Z3 c3 branch vs ZIPT
+
+You are an AI agent that benchmarks Z3 string solvers (`seq` and `nseq`) and the standalone ZIPT solver on all SMT-LIB2 benchmarks from the `tests/ostrich.zip` archive on the `c3` branch, and publishes a summary report as a GitHub discussion.
+
+## Context
+
+- **Repository**: ${{ github.repository }}
+- **Workspace**: ${{ github.workspace }}
+- **Branch**: c3 (already checked out by the workflow setup step)
+
+## Phase 1: Build Z3
+
+Build Z3 from the checked-out `c3` branch using CMake + Ninja, including the .NET bindings required by ZIPT.
+
+```bash
+cd ${{ github.workspace }}
+
+# Install build dependencies if missing
+sudo apt-get install -y ninja-build cmake python3 zstd dotnet-sdk-8.0 unzip 2>/dev/null || true
+
+# Configure the build in Debug mode to enable assertions and tracing
+# (Debug mode is required for -tr: trace flags to produce meaningful output)
+mkdir -p build
+cd build
+cmake .. -G Ninja -DCMAKE_BUILD_TYPE=Debug -DZ3_BUILD_DOTNET_BINDINGS=ON 2>&1 | tail -20
+
+# Build z3 binary and .NET bindings (this takes ~15-17 minutes)
+ninja z3 2>&1 | tail -30
+ninja build_z3_dotnet_bindings 2>&1 | tail -20
+
+# Verify the build succeeded
+./z3 --version
+
+# Locate the Microsoft.Z3.dll produced by the build
+Z3_DOTNET_DLL=$(find . -name "Microsoft.Z3.dll" -not -path "*/obj/*" | head -1)
+if [ -z "$Z3_DOTNET_DLL" ]; then
+    echo "ERROR: Microsoft.Z3.dll not found after build"
+    exit 1
+fi
+echo "Found Microsoft.Z3.dll at: $Z3_DOTNET_DLL"
+```
+
+If the build fails, report the error clearly and exit without proceeding.
+
+## Phase 2a: Clone and Build ZIPT
+
+Clone the ZIPT solver from the `parikh` branch and compile it against the Z3 .NET bindings built in Phase 1.
+
+```bash
+cd ${{ github.workspace }}
+
+# Re-locate the Microsoft.Z3.dll if needed
+Z3_DOTNET_DLL=$(find build -name "Microsoft.Z3.dll" -not -path "*/obj/*" | head -1)
+Z3_LIB_DIR=${{ github.workspace }}/build
+
+# Clone ZIPT (parikh branch)
+git clone --depth=1 --branch parikh https://github.com/CEisenhofer/ZIPT.git /tmp/zipt
+
+# Patch ZIPT.csproj to point at the freshly built Microsoft.Z3.dll
+# (the repo has a Windows-relative hardcoded path that won't exist here)
+sed -i "s|<HintPath>.*</HintPath>|<HintPath>$Z3_DOTNET_DLL</HintPath>|" /tmp/zipt/ZIPT/ZIPT.csproj
+
+# Build ZIPT in Release mode
+cd /tmp/zipt/ZIPT
+dotnet build --configuration Release 2>&1 | tail -20
+
+# Locate the built ZIPT.dll
+ZIPT_DLL=$(find /tmp/zipt/ZIPT/bin/Release -name "ZIPT.dll" | head -1)
+if [ -z "$ZIPT_DLL" ]; then
+    echo "ERROR: ZIPT.dll not found after build"
+    exit 1
+fi
+echo "ZIPT binary: $ZIPT_DLL"
+
+# Make libz3.so visible to the .NET runtime at ZIPT startup
+ZIPT_OUT_DIR=$(dirname "$ZIPT_DLL")
+if cp "$Z3_LIB_DIR/libz3.so" "$ZIPT_OUT_DIR/" 2>/dev/null; then
+    echo "Copied libz3.so to $ZIPT_OUT_DIR"
+else
+    echo "WARNING: could not copy libz3.so to $ZIPT_OUT_DIR — setting LD_LIBRARY_PATH fallback"
+fi
+export LD_LIBRARY_PATH="$Z3_LIB_DIR${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}"
+echo "ZIPT build complete."
+```
+
+If the ZIPT build fails, note the error in the report but continue with the Z3-only benchmark columns.
+
+## Phase 2b: Extract Benchmark Files
+
+Extract all SMT-LIB2 files from the `tests/ostrich.zip` archive.
+
+```bash
+cd ${{ github.workspace }}
+
+# Extract the zip archive
+mkdir -p /tmp/ostrich_benchmarks
+unzip -q tests/ostrich.zip -d /tmp/ostrich_benchmarks
+
+# List all .smt2 files
+find /tmp/ostrich_benchmarks -name "*.smt2" -type f | sort > /tmp/all_ostrich_files.txt
+TOTAL_FILES=$(wc -l < /tmp/all_ostrich_files.txt)
+echo "Total Ostrich .smt2 files: $TOTAL_FILES"
+
+if [ "$TOTAL_FILES" -eq 0 ]; then
+    echo "ERROR: No .smt2 files found in tests/ostrich.zip"
+    exit 1
+fi
+```
+
+## Phase 3: Run Benchmarks
+
+Run every file from `/tmp/all_ostrich_files.txt` with both Z3 string solvers and ZIPT. Use a **5-second timeout** per run.
+
+For each file, run:
+1. `z3 smt.string_solver=seq -T:5 <file>` — seq solver
+2. `z3 smt.string_solver=nseq -T:5 <file>` — nseq (ZIPT) solver
+3. `dotnet <ZIPT.dll> -t:5000 <file>` — standalone ZIPT solver (milliseconds)
+
+Capture:
+- **Verdict**: `sat`, `unsat`, `unknown`, `timeout` (if exit code indicates timeout or process is killed), or `bug` (if a solver crashes / produces a non-standard result)
+- **Time** (seconds): wall-clock time for the run
+- A row is flagged `SOUNDNESS_DISAGREEMENT` when any two solvers that both produced a definitive answer (sat/unsat) disagree
+
+Use a bash script to automate this:
+
+```bash
+#!/usr/bin/env bash
+set -euo pipefail
+
+Z3=${{ github.workspace }}/build/z3
+ZIPT_DLL=$(find /tmp/zipt/ZIPT/bin/Release -name "ZIPT.dll" 2>/dev/null | head -1)
+ZIPT_AVAILABLE=false
+[ -n "$ZIPT_DLL" ] && ZIPT_AVAILABLE=true
+
+# Ensure libz3.so is on the dynamic-linker path for the .NET runtime
+export LD_LIBRARY_PATH=${{ github.workspace }}/build${LD_LIBRARY_PATH:+:$LD_LIBRARY_PATH}
+
+RESULTS=/tmp/benchmark_results.tsv
+mkdir -p /tmp/ostrich_run
+
+echo -e "file\tseq_verdict\tseq_time\tnseq_verdict\tnseq_time\tzipt_verdict\tzipt_time\tnotes" > "$RESULTS"
+
+run_z3_seq() {
+    local file="$1"
+    local start end elapsed verdict output exit_code
+
+    start=$(date +%s%3N)
+    output=$(timeout 7 "$Z3" "smt.string_solver=seq" -T:5 "$file" 2>&1)
+    exit_code=$?
+    end=$(date +%s%3N)
+    elapsed=$(echo "scale=3; ($end - $start) / 1000" | bc)
+
+    if echo "$output" | grep -q "^unsat"; then
+        verdict="unsat"
+    elif echo "$output" | grep -q "^sat"; then
+        verdict="sat"
+    elif echo "$output" | grep -q "^unknown"; then
+        verdict="unknown"
+    elif [ "$exit_code" -eq 124 ]; then
+        verdict="timeout"
+    elif echo "$output" | grep -qi "error\|assertion\|segfault\|SIGABRT\|exception"; then
+        verdict="bug"
+    else
+        verdict="unknown"
+    fi
+
+    echo "$verdict $elapsed"
+}
+
+run_z3_nseq() {
+    local file="$1"
+    local start end elapsed verdict output exit_code
+
+    start=$(date +%s%3N)
+    output=$(timeout 7 "$Z3" "smt.string_solver=nseq" -T:5 "$file" 2>&1)
+    exit_code=$?
+    end=$(date +%s%3N)
+    elapsed=$(echo "scale=3; ($end - $start) / 1000" | bc)
+
+    if echo "$output" | grep -q "^unsat"; then
+        verdict="unsat"
+    elif echo "$output" | grep -q "^sat"; then
+        verdict="sat"
+    elif echo "$output" | grep -q "^unknown"; then
+        verdict="unknown"
+    elif [ "$exit_code" -eq 124 ]; then
+        verdict="timeout"
+    elif echo "$output" | grep -qi "error\|assertion\|segfault\|SIGABRT\|exception"; then
+        verdict="bug"
+    else
+        verdict="unknown"
+    fi
+
+    echo "$verdict $elapsed"
+}
+
+run_zipt() {
+    local file="$1"
+    local start end elapsed verdict output exit_code
+
+    if [ "$ZIPT_AVAILABLE" != "true" ]; then
+        echo "n/a 0.000"
+        return
+    fi
+
+    start=$(date +%s%3N)
+    # ZIPT prints the filename on the first line, then SAT/UNSAT/UNKNOWN on subsequent lines
+    output=$(timeout 7 dotnet "$ZIPT_DLL" -t:5000 "$file" 2>&1)
+    exit_code=$?
+    end=$(date +%s%3N)
+    elapsed=$(echo "scale=3; ($end - $start) / 1000" | bc)
+
+    if echo "$output" | grep -qi "^UNSAT$"; then
+        verdict="unsat"
+    elif echo "$output" | grep -qi "^SAT$"; then
+        verdict="sat"
+    elif echo "$output" | grep -qi "^UNKNOWN$"; then
+        verdict="unknown"
+    elif [ "$exit_code" -eq 124 ]; then
+        verdict="timeout"
+    elif echo "$output" | grep -qi "error\|crash\|exception\|Unsupported"; then
+        verdict="bug"
+    else
+        verdict="unknown"
+    fi
+
+    echo "$verdict $elapsed"
+}
+
+COUNTER=0
+while IFS= read -r file; do
+    COUNTER=$((COUNTER + 1))
+    fname=$(basename "$file")
+
+    seq_result=$(run_z3_seq "$file")
+    nseq_result=$(run_z3_nseq "$file")
+    zipt_result=$(run_zipt "$file")
+
+    seq_verdict=$(echo "$seq_result" | cut -d' ' -f1)
+    seq_time=$(echo "$seq_result" | cut -d' ' -f2)
+    nseq_verdict=$(echo "$nseq_result" | cut -d' ' -f1)
+    nseq_time=$(echo "$nseq_result" | cut -d' ' -f2)
+    zipt_verdict=$(echo "$zipt_result" | cut -d' ' -f1)
+    zipt_time=$(echo "$zipt_result" | cut -d' ' -f2)
+
+    # Flag soundness disagreement when any two definitive verdicts disagree
+    notes=""
+    declare -A definitive_map
+    [ "$seq_verdict"  = "sat" ] || [ "$seq_verdict"  = "unsat" ] && definitive_map[seq]="$seq_verdict"
+    [ "$nseq_verdict" = "sat" ] || [ "$nseq_verdict" = "unsat" ] && definitive_map[nseq]="$nseq_verdict"
+    [ "$zipt_verdict" = "sat" ] || [ "$zipt_verdict" = "unsat" ] && definitive_map[zipt]="$zipt_verdict"
+    has_sat=false; has_unsat=false
+    for v in "${definitive_map[@]}"; do
+        [ "$v" = "sat"   ] && has_sat=true
+        [ "$v" = "unsat" ] && has_unsat=true
+    done
+    if $has_sat && $has_unsat; then
+        notes="SOUNDNESS_DISAGREEMENT"
+    fi
+
+    echo -e "$fname\t$seq_verdict\t$seq_time\t$nseq_verdict\t$nseq_time\t$zipt_verdict\t$zipt_time\t$notes" >> "$RESULTS"
+    echo "[$COUNTER] [$fname] seq=$seq_verdict(${seq_time}s) nseq=$nseq_verdict(${nseq_time}s) zipt=$zipt_verdict(${zipt_time}s) $notes"
+done < /tmp/all_ostrich_files.txt
+
+echo "Benchmark run complete. Results saved to $RESULTS"
+```
+
+Save this script to `/tmp/run_ostrich_benchmarks.sh`, make it executable, and run it. Do not skip any file.
+
+## Phase 4: Generate Summary Report
+
+Read `/tmp/benchmark_results.tsv` and compute statistics. Then generate a Markdown report.
+
+Compute:
+- **Total benchmarks**: total number of files run
+- **Per solver (seq, nseq, and ZIPT)**: count of sat / unsat / unknown / timeout / bug verdicts
+- **Total time used**: sum of all times for each solver
+- **Average time per benchmark**: total_time / total_files
+- **Soundness disagreements**: files where any two solvers that both returned a definitive answer disagree
+- **Bugs / crashes**: files with error/crash verdicts
+
+Format the report as a GitHub Discussion post (GitHub-flavored Markdown):
+
+```markdown
+### Ostrich Benchmark Report — Z3 c3 branch
+
+**Date**: <today's date>
+**Branch**: c3
+**Benchmark set**: Ostrich (all files from tests/ostrich.zip)
+**Timeout**: 5 seconds per benchmark (`-T:5` for Z3; `-t:5000` for ZIPT)
+
+---
+
+### Summary
+
+| Metric | seq solver | nseq solver | ZIPT solver |
+|--------|-----------|-------------|-------------|
+| sat | X | X | X |
+| unsat | X | X | X |
+| unknown | X | X | X |
+| timeout | X | X | X |
+| bug/crash | X | X | X |
+| **Total time (s)** | X.XXX | X.XXX | X.XXX |
+| **Avg time/benchmark (s)** | X.XXX | X.XXX | X.XXX |
+
+**Soundness disagreements** (any two solvers return conflicting sat/unsat): N
+
+---
+
+### Per-File Results
+
+<details>
+<summary>Click to expand full per-file table</summary>
+
+| # | File | seq verdict | seq time (s) | nseq verdict | nseq time (s) | ZIPT verdict | ZIPT time (s) | Notes |
+|---|------|-------------|-------------|--------------|--------------|--------------|--------------|-------|
+| 1 | benchmark_0001.smt2 | sat | 0.123 | sat | 0.456 | sat | 0.789 | |
+| ... | ... | ... | ... | ... | ... | ... | ... | ... |
+
+</details>
+
+---
+
+### Notable Issues
+
+#### Soundness Disagreements (Critical)
+<list files where any two solvers disagree on sat/unsat, naming which solvers disagree>
+
+#### Crashes / Bugs
+<list files where any solver crashed or produced an error>
+
+#### Slow Benchmarks (> 4s)
+<list files that took more than 4 seconds for any solver>
+
+---
+
+*Generated automatically by the Ostrich Benchmark workflow on the c3 branch.*
+```
+
+## Phase 5: Post to GitHub Discussion
+
+Post the Markdown report as a new GitHub Discussion using the `create-discussion` safe output.
+
+- **Category**: "Agentic Workflows"
+- **Title**: `[Ostrich Benchmark] Z3 c3 branch — <date>`
+- Close older discussions with the same title prefix to avoid clutter.
+
+## Guidelines
+
+- **Always build from c3 branch**: The workspace is already checked out on c3; don't change branches.
+- **Debug build required**: The build must use `CMAKE_BUILD_TYPE=Debug` so that Z3's internal assertions are active.
+- **Run all benchmarks**: Unlike the QF_S workflow, run every file in the archive — do not randomly sample.
+- **5-second timeout**: Pass `-T:5` to Z3 (both seq and nseq) and `-t:5000` to ZIPT (milliseconds). Use `timeout 7` as the outer OS-level guard to allow the solver to exit cleanly before being killed.
+- **Be precise with timing**: Use millisecond-precision timestamps and report times in seconds with 3 decimal places.
+- **Distinguish timeout from unknown**: A timeout is different from `(unknown)` returned by a solver within its time budget.
+- **ZIPT output format**: ZIPT prints the input filename on the first line, then `SAT`, `UNSAT`, or `UNKNOWN` on subsequent lines. Parse accordingly.
+- **Report soundness bugs prominently**: If any benchmark shows a conflict between any two solvers that both returned a definitive sat/unsat answer, highlight it as a critical finding and name which pair disagrees.
+- **Handle build failures gracefully**: If Z3 fails to build, report the error and create a brief discussion noting the build failure. If ZIPT fails to build, continue with only the seq/nseq columns and note `n/a` for ZIPT results.
+- **Large report**: Always put the per-file table in a `<details>` collapsible section since there may be many files.
+- **Progress logging**: Print a line per file as you run it (e.g., `[N] [filename] seq=...`) so the workflow log shows progress even for large benchmark sets.