Run ID: 2026-04-24T10-29-21_magellan-pay
Plugin: magellan-pay v1.0.0 — sandbox WooCommerce payment gateway + transaction log + refund support
Ecosystem: woocommerce (first pilot exercising skills/woocommerce-exploration/SKILL.md)
Driver: Chrome DevTools MCP with --experimental-page-id-routing
Dispatch: 6 charters in one concurrent wave (Sonnet-default Testers, blind greybox — ISSUES.md stripped)
Wallclock (wave): ~34 min for 6 concurrent Testers; ~60 min total including recon + classifier + aggregation
Recall 8/10 on a blind pilot against a plugin shape the harness has never seen. Highest blind-run recall in project history. No rerun needed to get here. Previously:
| Pilot | Shape | Mode | Original | Rerun after amendments |
|---|---|---|---|---|
| 1 (backups) | admin artifact-producer | Opus blind | 10/10 | — |
| 2 (contact-forms) | form + email | Opus blind | 7/10 | 10/10 |
| 3 (members) | role / restriction / CRUD | Opus blind | 5/10 | 10/10 |
| 4 (seo-toolkit) | metadata / sitemap / rendering | Sonnet blind | 4/10 | 10/10 |
| 5 (pay) | WC payment gateway | Sonnet blind | 8/10 | — |
The 15 amendments from pilots 1-4 are compounding: one new plugin shape, one new ecosystem, blind, 8/10 first try. 12 of the 15 amendments fired actively; 2 correctly didn't fire (no fuel); 1 partial-gap (Amendment E admin two-tab didn't cover the adjacent customer-submit surface — see miss analysis).
8/10 planted + 10 bonus findings. 18 Problems, 5 Questions, 12 Improvements, 14 Praises.
Severity: 3 critical, 11 major, 4 minor, 0 trivial.
| Charter | Priority | P | Q | I | ! | Duration | Tool uses | Planted caught |
|---|---|---|---|---|---|---|---|---|
| gateway-settings | critical | 4 | 1 | 1 | 2 | 11m 25s | 60 | #1, #4, #6, #7 (Amendment F-driven) |
| checkout-payment-flow | critical | 6 | 1 | 3 | 3 | 19m 49s | 84 | #8, #9 (+ 4 bonus criticals/majors: block checkout, Luhn, expiry, CVC) |
| refund-flow | critical | 2 | 1 | 2 | 2 | 19m 01s | 84 | #3 |
| transaction-log-scale | high | 2 | 0 | 2 | 3 | 15m 36s | 55 | #2 + bonus missing-index |
| cross-feature-stock-refund | high | 3 | 1 | 3 | 1 | 34m 22s | 145 | #8 (double-caught) + bonus disabled-gateway-still-processes |
| transaction-log-admin | medium | 1 | 1 | 1 | 3 | 17m 35s | 73 | + bonus critical (stored XSS via status class attr) |
| Totals | 18 | 5 | 12 | 14 | 117m 48s serial | 501 | 8/10 |
| # | Planted issue | Verdict | Amendment that fired |
|---|---|---|---|
| 1 | No test mode indicator on checkout title | caught-bundled | Amendment 2 (absence-of-feature, the stronger root-cause "testmode is fully dead") |
| 2 | Transaction log has no pagination | caught-exact | scale probe (c2 seed 10k rows) |
| 3 | Refund button works for wrong gateway | caught-exact | destructive-op AND-list + Amendment 4 cross-feature |
| 4 | Test mode doesn't separate test/live keys | caught-bundled | Amendment 2 (api_key/secret never consumed at all) |
| 5 | FLOAT vs DECIMAL for money | missed | no existing rule covers DDL column-type semantics |
| 6 | Empty API key saves silently in live mode | caught-bundled | Amendment 2 (subset of "keys never consumed") |
| 7 | API keys visible in page source as plain text | caught-exact | Amendment F (view-source) |
| 8 | Stock reduced before payment confirmation | caught-exact (x2) | Amendment 4 (cross-feature MANDATORY) + Amendment C (enumerate root cause) |
| 9 | Zero-total orders sent to gateway | caught-exact | Amendment C (sibling symptom of Issue 8 root cause) |
| 10 | Double-click creates duplicate orders | missed | Amendment E (two-tab concurrent) covers admin forms only, not customer-submit |
2 misses, 1 amendment family each — proposed as Amendment G (DDL types) + extension of Amendment E (rapid-double-submit). See "Next steps" below.
| Manager (Opus 4.7) | Subagents (Sonnet 4.6) | Total | |
|---|---|---|---|
| Agents | 1 | 7 (1 recon + 6 Testers) | 8 |
| Messages | 126 | 777 | 903 |
| Fresh input | 374 | 821 | 1,195 |
| Output | 142,510 | 115,035 | 257,545 |
| Cache-create 5m | 0 | 1,704,015 | 1,704,015 |
| Cache-create 1h | 579,879 | 0 | 579,879 |
| Cache-read | 30,240,716 | 71,101,881 | 101,342,597 |
| Total tokens | 30,963,479 | 72,921,752 | 103,885,231 |
| Cost | $24.48 | $29.45 | $53.93 |
97.6% of all tokens are cache-read. The prompt-caching discipline (1h cache for Manager, 5m cache for per-Tester context) remains the dominant cost-saving mechanism.
| Category | Tokens | Cost | % of cost |
|---|---|---|---|
| Cache-read | 101,342,597 | $36.45 | 67.6% |
| Cache-create 5m | 1,704,015 | $6.39 | 11.9% |
| Cache-create 1h | 579,879 | $5.80 | 10.7% |
| Output | 257,545 | $5.29 | 9.8% |
| Fresh input | 1,195 | $0.00 | 0.0% |
| Session | Role | Duration | Tool uses | Msgs | Input | Output | cc5m | cr | Cost |
|---|---|---|---|---|---|---|---|---|---|
| recon | scout | 3m 16s | 36 | 51 | 57 | 6,760 | 221,734 | 3,082,232 | $1.86 |
| gateway-settings | Tester | 11m 25s | 60 | 92 | 98 | 12,063 | 293,797 | 7,974,676 | $3.68 |
| transaction-log-scale | Tester | 15m 36s | 55 | 80 | 86 | 14,036 | 192,861 | 6,472,804 | $2.88 |
| transaction-log-admin | Tester | 17m 35s | 73 | 103 | 109 | 13,213 | 204,583 | 9,484,167 | $3.81 |
| refund-flow | Tester | 19m 01s | 84 | 124 | 130 | 17,110 | 246,250 | 12,911,194 | $5.05 |
| checkout-payment-flow | Tester | 19m 49s | 84 | 126 | 132 | 18,564 | 203,789 | 11,531,464 | $4.50 |
| cross-feature-stock-refund | Tester | 34m 22s | 145 | 201 | 209 | 33,289 | 341,001 | 19,645,344 | $7.67 |
| Totals (7) | 121m 04s serial | 537 | 777 | 821 | 115,035 | 1,704,015 | 71,101,881 | $29.45 |
Concurrent-wave compression: 6 Tester charters dispatched at roughly the same time; total sequential-equivalent = 117m 48s, wallclock of the wave = ~34m 22s (bounded by the longest Tester, cross-feature-stock-refund). Compression ratio: 3.4×.
Per-charter observations:
cross-feature-stock-refundis the outlier at 34m / 145 tool uses — three cross-feature seams required separate flows (payment × stock, refund × stock, settings × payment), each with its own setup. High tool-use count reflects the charter's ambition, not inefficiency; it caught the critical stock-leak bug (double-catch withcheckout-payment-flow) plus the bonus "disabled-gateway-still-processes-payments" critical.gateway-settingsis the cheapest Tester at $3.68 — settings form + view-source + source-grep work, minimal browser state. Finished first in the wave.- Tool-call serialization is the wave's bottleneck. Chrome DevTools MCP serializes tool handlers through a server mutex. Model reasoning parallelizes; tool dispatch queues. For 6 Testers making 60-145 tool calls each, the queue kept all 6 productive throughout and compression held at ~3.4×.
| Denominator | Value |
|---|---|
| Total cost / planted caught | $6.74 per planted bug (8 caught) |
| Total cost / all Problems filed | $3.00 per Problem (18 filed) |
| Total cost / total PQIP items | $1.10 per PQIP item (49 items total) |
Compared to Pilot 4 rerun ($4.12/planted productive / $5.50/planted actual) — Pilot 5 is slightly higher per-planted because the ecosystem (WC) required more per-Tester setup work (baseline plugin, product creation, coming-soon mode, etc.) and the cross-feature-stock-refund charter ran long. The bonus-findings factor is much better: 10 bonus Problems means total-Problem cost is only $3.00 vs Pilot 4's $2.04 — but on the planted-only metric, $6.74 reflects the harder plugin shape and first-of-kind ecosystem exercise.
No wasted cost this run (no laptop-sleep retry). Clean single-wave execution.
12 of 15 existing amendments fired actively. 2 correctly did not fire (no fuel). 1 (Amendment E) had a partial gap.
| Amendment | Fired? | Load-bearing? | Notes |
|---|---|---|---|
| 1. Empty / one-item / full states | ✓ | — | Mandatory coverage-note string in all 6 sessions |
| 2. Absence-of-feature | ✓✓ | Yes | 3 major findings in gateway-settings (testmode, api_key/secret, uninstall hook) |
| 3. Plugin-native writes over synthetic seeds | ✓ | — | Used real checkout/refund paths; direct DB seed only for scale charter |
| 4. Cross-feature interaction (MANDATORY) | ✓✓✓ | Yes | Caught Issue 8 stock-before-payment — the single-highest-impact bug. Surfaced 2 bonus criticals. |
| 5. UI-path before "missing" claim | ✓ | — | No empirically-wrong claims filed |
| A. Inline counters | — | n/a | No live-counter UI — correct non-activation |
| B. Seed state variety | ✓ | — | transaction-log-admin seeded each status + XSS probe row |
| C. Enumerate root-cause surface | ✓✓ | Yes | Tester chained 3 bugs from wc_reduce_stock_levels-before-API-call root cause |
| D. Unsaved-work protection | ✓ (negative) | — | Probed; WC core provides it; no Problem filed (correct) |
| E. Two-tab concurrent (MANDATORY) | partial / gap | — | Fired on admin forms; didn't cover customer-submit (Issue 10 missed — propose extension) |
| F. View-source HTML | ✓✓ | Yes | Caught Issue 7 (API Secret plaintext) — DOM would have normalized; raw HTML fetch was the difference |
| Reinforce 5 empty-state | ✓ | — | 6/6 sessions carry the mandated coverage-note string |
| Reinforce 8 cross-feature | ✓ | — | 5/6 sessions carry the mandated string |
| pqip.propagate-sibling-features | ✓ | — | Luhn → expiry → CVC all filed together; refund stock-restore-absence flagged as sibling to stock-leak |
| pqip.UI-path-before-claim | ✓ | — | No over-claims filed |
Three "first time the harness does this" things worked:
woocommerce-explorationskill activation — recon identified block-checkout incompatibility,wc_reduce_stock_levelssemantics,restock_itemsflag, HPOS considerations before Tester dispatch. Visible in Tester outputs (e.g.,_order_stock_reducedmeta analysis, directprocess_refundcall throughwc_get_order).- Concurrent wave on a WC-ecosystem plugin — 6 Testers each provisioning Studio + installing WooCommerce + activating magellan-pay + executing charter. Zero provision-time failures. Compression 3.4×.
- Amendment 4 (cross-feature MANDATORY) as designed — the dedicated
cross-feature-stock-refundcharter IS the forcing function that caught Issue 8, the highest-severity bug. Not a coincidence; this is exactly what the MANDATORY-reinforcement shipping in Pilot 4 rerun was designed to produce.
Miss 1 (Issue 5 FLOAT for money) is a generalizable bug class — the harness's DB-writing anchor probes injection + insert-return but not column-type appropriateness.
Proposed rule (draft):
Inspect column types for value semantics, not just column existence. When a plugin's
CREATE TABLE/dbDeltaDDL stores money, time, identifiers, or any data with strict correctness requirements, verify the column type matches the semantic. Money →DECIMAL(p,s)neverFLOAT/DOUBLE(IEEE-754 rounding corrupts cents). Timestamps →DATETIME/BIGINTfor epoch, neverINT(Y2038). IDs that reference external systems → check type matches the upstream (UUID vs BIGINT vs VARCHAR). Reproducer: write a known value (e.g.19.99), read raw via$wpdb->get_var, compare bytewise.
Targets Miss 1 as a class. Ships to skills/tester-mindset/SKILL.md in the DB-writing anchor section.
Miss 2 (Issue 10 double-click duplicate orders) is an adjacent shape to the existing Amendment E's admin-form two-tab probe. Same concurrency family, different surface.
Proposed extension:
Rapid-double-submit probe on user-facing write actions. Any user-facing form that performs a database write or external side effect on submit (checkout, place order, register, subscribe, post comment, contact form) must be probed for rapid-double-click idempotency. Reproducer: programmatically click the submit button twice within 200ms (
await page.click(sel); await page.click(sel);) or fire twoform.requestSubmit()calls. Check for disabled-on-click state, nonce-based idempotency key, or server-side duplicate-write detection.
Targets Miss 2 as a class. Extends existing Amendment E block.
Recommended because file-handling (upload MIME, path traversal, image-size variants, visibility) is a well-understood bug class currently absent from the harness history. Will test whether proposed Amendment G's column-type rule generalizes to file-metadata storage. Defer magellan-speed to a later pilot — SFDPOT Time deserves its own focused run.
pilot → /escape-analysis → human reviews proposals
→ commit amendments → re-run → /escape-analysis (validation pass)
→ confirm 10/10 → log to docs/harness-retrospectives.md → next pilot
For Pilot 5 specifically, the rerun is optional — 8/10 blind is already at the "converts to 10 with known gaps filled" threshold. The two proposed amendments (G + E-extension) can either ship before a rerun to validate compounding, or ship together with Pilot 6 for a cleaner attribution test.
- Final report:
runs/2026-04-24T10-29-21_magellan-pay/final-report.md - Escape analysis:
runs/2026-04-24T10-29-21_magellan-pay/escape-analysis.md - Token usage (full detail):
runs/2026-04-24T10-29-21_magellan-pay/token-usage.json - Manifest:
runs/2026-04-24T10-29-21_magellan-pay/manifest.json - 6 session reports:
runs/2026-04-24T10-29-21_magellan-pay/sessions/<slug>/report.json - Static analysis:
runs/2026-04-24T10-29-21_magellan-pay/static-analysis.md - Recon:
runs/2026-04-24T10-29-21_magellan-pay/recon.md - Coverage plan:
runs/2026-04-24T10-29-21_magellan-pay/coverage.md