delight: pre-compute sampling + tighten tools to cut ~530K tokens/run by Copilot · Pull Request #29227 · github/gh-aw

Copilot · 2026-04-30T01:03:50Z

delight.md was burning 34 inference turns on a fully read-only run (0 write actions, 0.49% output tokens) — half of those turns were pure file discovery and memory loading that the agent was re-doing from scratch each run.

Changes

pre-agent-steps — pre-samples doc files, message workflows, and validation files; pre-loads both memory JSON files into /tmp/gh-aw/agent/ before the agent starts, eliminating ~6 exploratory turns (~365K tokens)
Removed edit: tool — never invoked; tool schema was included in every turn's context (~25K tokens)
Tightened bash allow-list — removed unbounded grep -r '*' docs and cat *; replaced with path-scoped equivalents (cat docs/src/content/docs/*.md, cat /tmp/gh-aw/agent/*, etc.) (~100K tokens)
Dropped shared/jqschema.md import — adds JSON schema tooling context irrelevant to this workflow's narrative/prose output (~40K tokens)
Updated prompt — all four sampling sections and Step 1 (Load Historical Memory) now reference pre-computed /tmp/gh-aw/agent/ files instead of issuing discovery commands

pre-agent-steps:
  - name: Sample files and load memory
    run: |
      mkdir -p /tmp/gh-aw/agent
      find docs/src/content/docs \( -name '*.md' -o -name '*.mdx' \) | shuf -n 2 > /tmp/gh-aw/agent/doc-samples.txt
      grep -rl "messages:" .github/workflows/ --include="*.md" | shuf -n 2 > /tmp/gh-aw/agent/workflow-samples.txt
      find pkg -name '*validation*.go' | shuf -n 1 > /tmp/gh-aw/agent/validation-sample.txt || echo "No validation files found" > /tmp/gh-aw/agent/validation-sample.txt
      cat memory/delight/previous-findings.json 2>/dev/null > /tmp/gh-aw/agent/previous-findings.json || echo "[]" > /tmp/gh-aw/agent/previous-findings.json
      cat memory/delight/improvement-themes.json 2>/dev/null > /tmp/gh-aw/agent/improvement-themes.json || echo "[]" > /tmp/gh-aw/agent/improvement-themes.json

Estimated total savings: ~530K tokens/run (~25% of 2.08M baseline).

Warning

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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)

…avings) - Add pre-agent-steps to pre-compute file sampling and memory loads (eliminates ~6 exploratory agent turns, ~365K tokens/run) - Remove unused edit: tool (workflow is read-only, ~25K tokens/run) - Tighten bash allow-list: remove grep -r '*' docs and cat *, add scoped path-specific commands (~100K tokens/run) - Drop unused shared/jqschema.md import (~40K tokens/run) - Update prompt to reference pre-computed /tmp/gh-aw/agent/ files Resolves #copilot-token-optimizer issue for delight.md workflow" Agent-Logs-Url: https://github.com/github/gh-aw/sessions/5a95abc6-619c-4888-b650-517387fd25ca Co-authored-by: pelikhan <4175913+pelikhan@users.noreply.github.com>

github-actions · 2026-04-30T01:31:22Z

Hey @Copilot 👋 — great work on the delight workflow efficiency improvements! Pre-computing sampling steps and tightening the bash allow-list to cut ~530K tokens/run (~25% of baseline) is a meaningful and well-scoped optimization.

One small thing to note before this lands:

No test changes — the diff only touches .github/workflows/delight.lock.yml and the companion workflow file. If there are any unit or integration tests that exercise the pre-agent-steps logic or the updated bash allow-list patterns, it would be worth verifying they still pass (or adding coverage for the new pre-sampling shell script). If tests genuinely don't apply to these workflow config files, a brief note in the PR body saying so would help reviewers move faster.

If you'd like a hand addressing this, here's a ready-to-use prompt:

Review the changes in PR #29227 (delight workflow token optimizations) and determine whether any existing tests cover the pre-agent-steps shell script or the updated bash allow-list. If tests exist, confirm they pass. If no tests cover this area and testable logic exists (e.g., the shell script that pre-loads memory files), add appropriate tests under the existing test suite. If the changes are purely declarative YAML config with no testable logic, add a comment to the PR body explicitly noting that tests are not applicable.

Generated by Contribution Check · ● 1.5M · ◷

Copilot

Pull request overview

Optimizes the delight agentic workflow to reduce token usage by precomputing sampling/memory inputs ahead of agent start and tightening the tool allow-list.

Changes:

Add pre-agent-steps to pre-sample docs/workflows/validation targets and pre-load delight memory JSON into /tmp/gh-aw/agent/.
Remove unused edit: tool schema and drop shared/jqschema.md import to reduce prompt/tooling overhead.
Tighten bash allow-list and update workflow instructions to consume the precomputed /tmp/gh-aw/agent/* artifacts.

Show a summary per file

File	Description
.github/workflows/delight.md	Adds pre-agent sampling + memory preload, removes unused tooling/import, updates bash allow-list and prompt instructions accordingly.
.github/workflows/delight.lock.yml	Regenerated compiled workflow reflecting updated imports, pre-agent step insertion, and updated tool allow-list.

Copilot's findings

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Comments suppressed due to low confidence (1)

.github/workflows/delight.md:70

grep -rl "messages:" .github/workflows/ --include="*.md" searches recursively under .github/workflows/, so the sample list can include .github/workflows/shared/*.md. The bash allow-list only permits cat .github/workflows/*.md (top-level), so the agent may not be able to read the sampled workflow file. Either scope the grep to only top-level workflows, or expand the allow-list / pre-copy sampled files into /tmp/gh-aw/agent/ similarly to the docs sampling.

      # Sample workflows with messages (pre-compute instead of agent grep)
      grep -rl "messages:" .github/workflows/ --include="*.md" | shuf -n 2 > /tmp/gh-aw/agent/workflow-samples.txt
      # Sample validation files

Files reviewed: 2/2 changed files
Comments generated: 1

+      find docs/src/content/docs \( -name '*.md' -o -name '*.mdx' \) | shuf -n 2 > /tmp/gh-aw/agent/doc-samples.txt
+      # Sample workflows with messages (pre-compute instead of agent grep)
+      grep -rl "messages:" .github/workflows/ --include="*.md" | shuf -n 2 > /tmp/gh-aw/agent/workflow-samples.txt


Initial plan

bac4833

Copilot AI assigned Copilot and pelikhan Apr 30, 2026

Copilot started work on behalf of pelikhan April 30, 2026 01:03 View session

Copilot AI linked an issue Apr 30, 2026 that may be closed by this pull request

[copilot-token-optimizer] Delight: reduce 34-turn read-only run (~730K tokens/run savings) #29142

Closed

github-actions Bot mentioned this pull request Apr 30, 2026

[aw] No-Op Runs #29134

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Copilot AI changed the title ~~[WIP] Optimize Delight workflow to reduce read-only run tokens~~ delight: pre-compute sampling + tighten tools to cut ~530K tokens/run Apr 30, 2026

Copilot finished work on behalf of pelikhan April 30, 2026 01:16

Copilot AI requested a review from pelikhan April 30, 2026 01:16

pelikhan approved these changes Apr 30, 2026

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pelikhan marked this pull request as ready for review April 30, 2026 01:27

Copilot AI review requested due to automatic review settings April 30, 2026 01:27

pelikhan merged commit d54852a into main Apr 30, 2026
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pelikhan deleted the copilot/optimize-delight-read-only-run branch April 30, 2026 01:27

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[Contribution Check Report] Contribution Check — 2026-04-30 #29234

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delight: pre-compute sampling + tighten tools to cut ~530K tokens/run#29227

delight: pre-compute sampling + tighten tools to cut ~530K tokens/run#29227
pelikhan merged 2 commits intomainfrom
copilot/optimize-delight-read-only-run

Copilot AI commented Apr 30, 2026 •

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Copilot AI commented Apr 30, 2026 •

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