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Optimize security-guard Claude token usage via prompt cache alignment and smaller diff payloads #2085

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Merged
lpcox merged 4 commits into from
Apr 18, 2026
Merged

Optimize security-guard Claude token usage via prompt cache alignment and smaller diff payloads #2085

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41faee5
Initial plan
Copilot Apr 18, 2026
a1ee146
chore: optimize security-guard workflow token usage
Copilot Apr 18, 2026
b5e3048
chore: refine security-guard diff truncation handling
Copilot Apr 18, 2026
3cabb26
chore: align security-guard max turns env with workflow limit
Copilot Apr 18, 2026
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7 changes: 3 additions & 4 deletions .github/workflows/security-guard.lock.yml
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30 changes: 19 additions & 11 deletions .github/workflows/security-guard.md
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Original file line number Diff line number Diff line change
Expand Up @@ -11,7 +11,7 @@ permissions:
issues: read
engine:
id: claude
max-turns: 12
max-turns: 10
features:
cli-proxy: true
tools:
Expand All @@ -32,14 +32,22 @@ steps:
if: github.event.pull_request.number
run: |
DELIM="GHAW_PR_FILES_$(date +%s)"
DIFF_LIMIT=5000
DIFF_TMP="$(mktemp)"
{
echo "PR_FILES<<${DELIM}"
gh api "repos/${GH_REPO}/pulls/${PR_NUMBER}/files" \
--paginate --jq '.[] | "### " + .filename + " (+" + (.additions|tostring) + "/-" + (.deletions|tostring) + ")\n" + (.patch // "") + "\n"' \
| head -c 8000 || true
> "$DIFF_TMP" || true
DIFF_SIZE="$(wc -c < "$DIFF_TMP" | tr -d ' ')"
head -c "$DIFF_LIMIT" "$DIFF_TMP" || true
if [ "$DIFF_SIZE" -gt "$DIFF_LIMIT" ]; then
echo -e "\n[DIFF TRUNCATED at ${DIFF_LIMIT} bytes — use get_file_contents for full context]"
fi
echo ""
echo "${DELIM}"
} >> "$GITHUB_OUTPUT"
rm -f "$DIFF_TMP"
env:
GH_TOKEN: ${{ github.token }}
PR_NUMBER: ${{ github.event.pull_request.number }}
Expand Down Expand Up @@ -101,14 +109,6 @@ This repository implements a **network firewall for AI agents** that provides L7
- Wildcard pattern security (prevents overly broad patterns)
- Protocol prefix handling

## Changed Files (Pre-fetched)

The following PR diff has been pre-computed. Focus your security analysis on these changes:

```
${{ steps.pr-diff.outputs.PR_FILES }}
```

## Your Task

Analyze PR #${{ github.event.pull_request.number }} in repository ${{ github.repository }}.
Expand Down Expand Up @@ -170,4 +170,12 @@ If no security issues are found:
- Do not add a comment (use noop safe-output)
- The PR passes the security review

**SECURITY**: Be thorough but avoid false positives. Focus on actual security weakening, not code style or refactoring that maintains the same security level.
**SECURITY**: Be thorough but avoid false positives. Focus on actual security weakening, not code style or refactoring that maintains the same security level.

## Changed Files (Pre-fetched)

The following PR diff has been pre-computed. Focus your security analysis on these changes:

```
${{ steps.pr-diff.outputs.PR_FILES }}
```
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