Vercel React Best Practices · VibeRPGSimulator

React and Next.js rules for waterfalls, bundle size, server work, and re-renders.

How it works

Foe: Fog Wraith, missing facts, outdated docs or thin context.

Foes

Fog Wraith

Party · Context

PaladinYour agent100/100

Fog Wraith
The Fog Wraith blocks the way.
What really happensIt stands for missing facts, outdated docs or thin context.
Paladin: Context 100/100.
Haze
The Fog Wraith breathes haze. Swings start to miss.
What really happensWithout current docs, the agent guesses at APIs that may have changed.
Paladin takes 8. Paladin: Context 92/100. Paladin: Haze.
Vercel React Best Practices
The hero reads the React scroll before writing the next component.
What really happensThe agent loads vercel-react-best-practices when writing, reviewing, or refactoring React or Next.js code.
Fog Wraith takes 25.
Vercel React Best Practices
It opens the highest-impact rule that fits this change.
What really happensRules are grouped from waterfalls and bundle size down through server work, data fetching, re-renders, and smaller JS tweaks.
Fog Wraith takes 21.
Haze
The Fog Wraith uses Haze.
Paladin takes 8. Paladin: Context 84/100. Paladin: Haze.
Vercel React Best Practices
A ward holds the wrong pattern next to the one the scroll allows.
What really happensEach rules file has an incorrect example and a correct one, such as async-parallel or bundle-barrel-imports.
Fog Wraith takes 12. Paladin: Ward.
Vercel React Best Practices
The Fog Wraith drops a faster path through the same page.
What really happensYou get React or Next.js code checked against those rules. The skill does not run a profiler by itself.
Fog Wraith takes 42. Fog Wraith falls.
Victory
The Fog Wraith falls.

Learn this spell

Claude Code and Codex

npx skills add vercel-labs/agent-skills

Notes

npx skills add vercel-labs/agent-skills installs the skills in that repo, not this file alone. The skill lists rules in eight groups, led by waterfall removal and bundle size. Read the matching rules file before applying one. It does not run a profiler or edit code by itself. MIT is declared in SKILL.md; the repo has no LICENSE file.

Proving Grounds record

Controlled quest results, separate from recorded usage. Each setup pools runs across its quests. The per-quest table below has casts, cast time, mana, incantation and runes; medians are not pooled.

Hero: Claude Code 2.1.305; weapon (model): claude-opus-5-5; charge (effort): high; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Clear rate83%10 of 12 runs passed every check; Unarmed: 15 of 15 (matched quests)

Steadiness55%reliability: Wilson 95% lower bound

Buff-17 pp debuffvs Unarmed, only matched quests (12 equipped runs; 15 control runs)

Instant casts9 of 12runs cleared on the first prompt; Unarmed: 11 of 15 (matched quests)

Attunement100%12 of 12 runs opened an equipped skill

Upkeep+24% manaextra mana per run vs Unarmed, median of 4 quests

IncantationNot measuredoutput tokens per run vs Unarmed

Runes+0%lines added per run vs Unarmed, median of 4 quests

Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Clear rate75%27 of 36 runs passed every check; Unarmed: 132 of 158 (matched quests)

Steadiness59%reliability: Wilson 95% lower bound

Buff-9 pp debuffvs Unarmed, only matched quests (36 equipped runs; 158 control runs)

Instant casts20 of 36runs cleared on the first prompt; Unarmed: 105 of 158 (matched quests)

Attunement22%8 of 36 runs opened an equipped skill

Upkeep+1% manaextra mana per run vs Unarmed, median of 10 quests

IncantationNot measuredoutput tokens per run vs Unarmed

Runes-3%lines added per run vs Unarmed, median of 7 quests

Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Clear rate100%9 of 9 runs passed every check; Unarmed: 9 of 9 (matched quests)

Steadiness70%reliability: Wilson 95% lower bound

Buff+0 ppvs Unarmed, only matched quests (9 equipped runs; 9 control runs)

Instant casts8 of 9runs cleared on the first prompt; Unarmed: 8 of 9 (matched quests)

Attunement100%9 of 9 runs opened an equipped skill

UpkeepNot measuredextra mana per run vs Unarmed

IncantationNot measuredoutput tokens per run vs Unarmed

RunesNot measuredlines added per run vs Unarmed

Hero: OMP 18.8.3; weapon (model): anthropic/claude-haiku-5-5; charge (effort): low; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Clear rate89%8 of 9 runs passed every check; Unarmed: 8 of 9 (matched quests)

Steadiness57%reliability: Wilson 95% lower bound

Buff+0 ppvs Unarmed, only matched quests (9 equipped runs; 9 control runs)

Instant casts6 of 9runs cleared on the first prompt; Unarmed: 8 of 9 (matched quests)

Attunement67%6 of 9 runs opened an equipped skill

Upkeep+89% manaextra mana per run vs Unarmed, median of 3 quests

IncantationNot measuredoutput tokens per run vs Unarmed

RunesNot measuredlines added per run vs Unarmed

Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Clear rate100%9 of 9 runs passed every check; Unarmed: 9 of 9 (matched quests)

Steadiness70%reliability: Wilson 95% lower bound

Buff+0 ppvs Unarmed, only matched quests (9 equipped runs; 9 control runs)

Instant casts9 of 9runs cleared on the first prompt; Unarmed: 9 of 9 (matched quests)

Attunement22%2 of 9 runs opened an equipped skill

Upkeep+4% manaextra mana per run vs Unarmed, median of 3 quests

IncantationNot measuredoutput tokens per run vs Unarmed

RunesNot measuredlines added per run vs Unarmed

Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.

Clear rate100%6 of 6 runs passed every check; Unarmed: 36 of 36 (matched quests)

Steadiness61%reliability: Wilson 95% lower bound

Buff+0 ppvs Unarmed, only matched quests (6 equipped runs; 36 control runs)

Instant casts6 of 6runs cleared on the first prompt; Unarmed: 35 of 36 (matched quests)

Attunement0%0 of 6 runs opened an equipped skill

Upkeep+1% manaextra mana per run vs Unarmed, median of 3 quests

IncantationNot measuredoutput tokens per run vs Unarmed

RunesNot measuredlines added per run vs Unarmed

Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.

Clear rate100%6 of 6 runs passed every check; Unarmed: 9 of 9 (matched quests)

Steadiness61%reliability: Wilson 95% lower bound

Buff+0 ppvs Unarmed, only matched quests (6 equipped runs; 9 control runs)

Instant casts4 of 6runs cleared on the first prompt; Unarmed: 8 of 9 (matched quests)

Attunement33%2 of 6 runs opened an equipped skill

UpkeepNot measuredextra mana per run vs Unarmed

IncantationNot measuredoutput tokens per run vs Unarmed

RunesNot measuredlines added per run vs Unarmed

Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.

Clear rate100%6 of 6 runs passed every check; Unarmed: 9 of 9 (matched quests)

Steadiness61%reliability: Wilson 95% lower bound

Buff+0 ppvs Unarmed, only matched quests (6 equipped runs; 9 control runs)

Instant casts5 of 6runs cleared on the first prompt; Unarmed: 9 of 9 (matched quests)

Attunement0%0 of 6 runs opened an equipped skill

Upkeep+31% manaextra mana per run vs Unarmed, median of 3 quests

IncantationNot measuredoutput tokens per run vs Unarmed

RunesNot measuredlines added per run vs Unarmed

Per-quest Proving Grounds record
QuestFixed task	Clear ratePassed runs	SteadinessReliability lower bound	BuffClear-rate points vs Unarmed	Instant castsFirst-prompt clears	CastsPrompts to clear	Cast timeAgent runtime	ManaCost at API list prices	IncantationOutput tokens	RunesLines added / removed	AttunementSkills opened	SetupApp, model, effort and sandbox
Illusionist: pricing plan switcherQuest v8	20%1 of 5Unarmed: 53% (9 of 17)	4%	-33 pp debuffvs Unarmed	1 of 520%Unarmed: 9 of 17	1	1m 33sUnarmed: 1m 37s	2,802 Unarmed: 2,764	Not reportedUnarmed: 14.5k	+366 / -4Unarmed: +394 / -3	100%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest illusionist-pricing-tabs --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v8 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Illusionist: booking form repairQuest v4	100%3 of 3Unarmed: 87% (13 of 15)	44%	+13 ppvs Unarmed	0 of 30%Unarmed: 0 of 15	2	1m 1sUnarmed: 1m 6s	1,640 Unarmed: 1,761	Not reportedUnarmed: 12.2k	+96 / -60Unarmed: +114 / -61	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest illusionist-signup-form --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v4 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: export endpoints security reviewQuest v2	100%3 of 3Unarmed: 100% (23 of 23)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 23 of 23	1	29sUnarmed: 31s	1,087 Unarmed: 1,129	Not reportedUnarmed: 3k	+7 / -0Unarmed: +7 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-export-handler --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	12sUnarmed: 14s	1,277 Unarmed: 1,134	Not reportedUnarmed: Not reported	+1 / -0Unarmed: +10 / -0	100%	Hero: Claude Code 2.1.305; weapon (model): claude-opus-5-5; charge (effort): high; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero claude-code --weapon 'claude-opus-5-5' --charge high --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%3 of 3Unarmed: 100% (12 of 12)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 12 of 12	1	8sUnarmed: 7s	469 Unarmed: 451	Not reportedUnarmed: 394	Not reportedUnarmed: +1 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%2 of 2Unarmed: 100% (12 of 12)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 12 of 12	1	6sUnarmed: 7s	457 Unarmed: 451	Not reportedUnarmed: 394	Not reportedUnarmed: +1 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	24sUnarmed: 21s	Not priced yet52.9k tokensUnarmed: Not priced yet	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	100%	Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero codex --weapon 'gpt-6-astra' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%2 of 2Unarmed: 100% (3 of 3)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 3 of 3	1	24sUnarmed: 21s	Not priced yet46.2k tokensUnarmed: Not priced yet	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero codex --weapon 'gpt-6-astra' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	2 of 367%Unarmed: 3 of 3	1	18sUnarmed: 15s	20 Unarmed: 10	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	33%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-haiku-5-5; charge (effort): low; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero omp --weapon 'anthropic/claude-haiku-5-5' --charge low --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	9sUnarmed: 7s	186 Unarmed: 179	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero omp --weapon 'anthropic/claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: missing-profile reviewQuest v2	100%2 of 2Unarmed: 100% (3 of 3)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 3 of 3	1	10sUnarmed: 7s	248 Unarmed: 179	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-null-guard --hero omp --weapon 'anthropic/claude-sonnet-5-5' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	21sUnarmed: 20s	1,454 Unarmed: 1,164	Not reportedUnarmed: Not reported	+22 / -0Unarmed: +5 / -0	100%	Hero: Claude Code 2.1.305; weapon (model): claude-opus-5-5; charge (effort): high; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero claude-code --weapon 'claude-opus-5-5' --charge high --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%3 of 3Unarmed: 100% (12 of 12)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 12 of 12	1	13sUnarmed: 14s	695 Unarmed: 616	Not reportedUnarmed: 1.1k	Not reportedUnarmed: +5 / -0	100%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%2 of 2Unarmed: 100% (12 of 12)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 12 of 12	1	12sUnarmed: 14s	622 Unarmed: 616	Not reportedUnarmed: 1.1k	Not reportedUnarmed: +5 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	31sUnarmed: 27s	Not priced yet56.7k tokensUnarmed: Not priced yet	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	100%	Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero codex --weapon 'gpt-6-astra' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%2 of 2Unarmed: 100% (3 of 3)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 3 of 3	1	38sUnarmed: 27s	Not priced yet55k tokensUnarmed: Not priced yet	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	100%	Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero codex --weapon 'gpt-6-astra' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	19sUnarmed: 16s	22 Unarmed: 14	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	100%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-haiku-5-5; charge (effort): low; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero omp --weapon 'anthropic/claude-haiku-5-5' --charge low --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	10sUnarmed: 11s	394 Unarmed: 235	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	67%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero omp --weapon 'anthropic/claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: queue component reviewQuest v2	100%2 of 2Unarmed: 100% (3 of 3)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 3 of 3	1	11sUnarmed: 11s	240 Unarmed: 235	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-react-list --hero omp --weapon 'anthropic/claude-sonnet-5-5' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: cut the next releaseQuest v3	33%1 of 3Unarmed: 100% (6 of 6)	6%	-67 pp debuffvs Unarmed	0 of 30%Unarmed: 2 of 6	2	1m 47sUnarmed: 1m 11s	4,675 Unarmed: 3,177	Not reportedUnarmed: Not reported	+28 / -4Unarmed: +28 / -4	100%	Hero: Claude Code 2.1.305; weapon (model): claude-opus-5-5; charge (effort): high; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-release-cut --hero claude-code --weapon 'claude-opus-5-5' --charge high --cast invoked --control` Recorded with quest v3 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: cut the next releaseQuest v3	100%3 of 3Unarmed: 89% (16 of 18)	44%	+11 ppvs Unarmed	0 of 30%Unarmed: 4 of 18	2	40sUnarmed: 43s	1,187 Unarmed: 1,274	Not reportedUnarmed: 2.1k	+28 / -4Unarmed: +28 / -4	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-release-cut --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v3 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: seat holds pull requestQuest v8	20%1 of 5Unarmed: 41% (7 of 17)	4%	-21 pp debuffvs Unarmed	1 of 520%Unarmed: 7 of 17	1	28sUnarmed: 28s	1,116 Unarmed: 1,086	Not reportedUnarmed: 2.4k	+6 / -0Unarmed: +6 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-seat-holds --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v8 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	20sUnarmed: 20s	1,646 Unarmed: 1,346	Not reportedUnarmed: Not reported	+28 / -0Unarmed: +28 / -0	100%	Hero: Claude Code 2.1.305; weapon (model): claude-opus-5-5; charge (effort): high; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero claude-code --weapon 'claude-opus-5-5' --charge high --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%3 of 3Unarmed: 100% (12 of 12)	44%	+0 ppvs Unarmed	2 of 367%Unarmed: 11 of 12	1	18sUnarmed: 19s	717 Unarmed: 721	Not reportedUnarmed: 1.7k	Not reportedUnarmed: +7 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%2 of 2Unarmed: 100% (12 of 12)	34%	+0 ppvs Unarmed	2 of 2100%Unarmed: 11 of 12	1	18sUnarmed: 19s	731 Unarmed: 721	Not reportedUnarmed: 1.7k	Not reportedUnarmed: +7 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	2 of 367%Unarmed: 2 of 3	1	43sUnarmed: 44s	Not priced yet56.8k tokensUnarmed: Not priced yet	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	100%	Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero codex --weapon 'gpt-6-astra' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%2 of 2Unarmed: 100% (3 of 3)	34%	+0 ppvs Unarmed	0 of 20%Unarmed: 2 of 3	2	1m 42sUnarmed: 44s	Not priced yet172.8k tokensUnarmed: Not priced yet	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero codex --weapon 'gpt-6-astra' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	67%2 of 3Unarmed: 67% (2 of 3)	21%	+0 ppvs Unarmed	1 of 333%Unarmed: 2 of 3	1.5	32sUnarmed: 21s	34 Unarmed: 18	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	67%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-haiku-5-5; charge (effort): low; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero omp --weapon 'anthropic/claude-haiku-5-5' --charge low --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%3 of 3Unarmed: 100% (3 of 3)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 3 of 3	1	12sUnarmed: 14s	296 Unarmed: 288	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero omp --weapon 'anthropic/claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Inquisitor: receipts security reviewQuest v2	100%2 of 2Unarmed: 100% (3 of 3)	34%	+0 ppvs Unarmed	1 of 250%Unarmed: 3 of 3	1.5	17sUnarmed: 14s	376 Unarmed: 288	Not reportedUnarmed: Not reported	Not reportedUnarmed: Not reported	0%	Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21. Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest inquisitor-sql-handler --hero omp --weapon 'anthropic/claude-sonnet-5-5' --charge medium --cast ambient --control` Recorded with quest v2 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Paladin: expense claims migrationQuest v1	80%4 of 5Unarmed: 76% (13 of 17)	38%	+4 ppvs Unarmed	4 of 580%Unarmed: 13 of 17	1	38sUnarmed: 37s	1,089 Unarmed: 1,072	Not reportedUnarmed: 4.4k	+149 / -0Unarmed: +157 / -0	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest paladin-expense-claims --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v1 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it
Paladin: RSVP Capacity and WaitlistQuest v7	100%3 of 3Unarmed: 100% (15 of 15)	44%	+0 ppvs Unarmed	3 of 3100%Unarmed: 14 of 15	1	2m 7sUnarmed: 2m 4s	3,682 Unarmed: 3,624	Not reportedUnarmed: 19k	+442 / -35Unarmed: +457 / -33	0%	Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.0 mishaps excluded. 2026-10-21 to 2026-10-21.Scrying (screenshot) Try this loadout `node "<spell-report-skill-directory>/scripts/spell-report.mjs" trial --spell vercel-react-best-practices --quest paladin-rsvp-waitlist --hero claude-code --weapon 'claude-sonnet-5-5' --charge medium --cast invoked --control` Recorded with quest v7 and spell commits `vercel-react-best-practices@063bee94c3f4df8453406c830b0a7df0f2860278`. How to run it

Scrying (screenshots of runs)

The latest run of each setup. Local paths, names and ids are blurred; credentials are removed.

Scrying (screenshot) of a fizzled run of Illusionist: pricing plan switcher with Vercel React Best Practices, Claude Code

Scrying (screenshot) of a cleared run of Illusionist: booking form repair with Vercel React Best Practices, Claude Code

Scrying (screenshot) of a cleared run of Inquisitor: export endpoints security review with Vercel React Best Practices, Claude Code

Also equipped in trial loadouts: Review React code and UI (workflow).

Explore the quests, full results and trial method

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How it works

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Notes

Proving Grounds record

Hero: Claude Code 2.1.305; weapon (model): claude-opus-5-5; charge (effort): high; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Hero: OMP 18.8.3; weapon (model): anthropic/claude-haiku-5-5; charge (effort): low; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; invoked cast (the prompt named the skill). macOS 27.0.1, arm64. Curator.

Hero: Claude Code 2.1.305; weapon (model): claude-sonnet-5-5; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.

Hero: Codex 0.154.0; weapon (model): gpt-6-astra; charge (effort): medium; arena: sealed; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.

Hero: OMP 18.8.3; weapon (model): anthropic/claude-sonnet-5-5; charge (effort): medium; arena: warded; ambient cast (the agent chose). macOS 27.0.1, arm64. Curator.

Scrying (screenshots of runs)

Equipped in these loadouts

Next.js feature, start to ship

Combos with this spell

Next.js app from dev to deploy

Review React code and UI