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async-await-error-tracing

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Mis à jour18 avril 2026 à 15:07

Debug async/await errors, unhandled promise rejections, and event loop blocking. Do not use for synchronous logic bugs or race conditions in concurrent systems.

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vheins

vheins/Notulensi

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Développeurs de logicielsProfessions informatiques et mathématiques·SOC 15-1252

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SKILL.md

readonly

name	async-await-error-tracing
description	Debug async/await errors, unhandled promise rejections, and event loop blocking. Do not use for synchronous logic bugs or race conditions in concurrent systems.
version	1.1.0
time_saved	Manual: 1–2 hours \| With skill: 10–20 minutes
license	Proprietary — Personal Use Only
category	debugging
complexity	Intermediate
tokens	~3500
tags	["async","await","promise","unhandled-rejection","event-loop","debugging"]
author	vheins

Skill: Async/Await Error Tracing

Purpose

Trace and fix async errors including unhandled rejections, missing awaits, and event loop blocking.

Input

Variable	Type	Req	Description
`tech_stack`	string	Yes	e.g., "Node.js + Express"
`error_message`	string	Yes	e.g., "UnhandledPromiseRejection"
`code`	string	Yes	Async logic section
`context`	string	Yes	Op flow and error expectations

Instructions

Classification: Identify type (Unhandled rejection, missing await, swallowing, loop blocking, forEach async, race).
Trace: Map execution path from creation to rejection and catch sites.
Remediation:
- Wrap awaits in try/catch.
- Ensure proper error propagation and re-throwing.
- Add contextual logging.
Config: Provide settings for better stack traces (e.g., --async-stack-traces).
Validation: Write test snippets verifying propagation (e.g., expect(...).rejects.toThrow()).
Fallback: If no code, provide execution model descriptions and diagnostic templates.

Edge Cases

Case	Strategy
Async in `forEach`	Recommend `Promise.all(array.map(...))` for sequential/parallel handling.
Event Loop Block	Recommend worker threads or `setImmediate` for heavy computation.
Intermittent Race	Add diagnostic logs around promise settlement points.

Tracing Flow

flowchart TD
    A[Parse inputs] --> B{Code available?}
    B -- No --> C[Describe async execution model]
    C --> D[Provide diagnostic template + tracing tools]
    B -- Yes --> E[Classify Async Error Type]
    E --> F[Trace Error Flow]
    F --> G[Apply Fix: try/catch + propagation + logging]
    G --> H[Improve async stack trace config]
    H --> I[Write test verifying error propagation]
    D --> J[Output: Diagnostic Path]
    I --> K[Output: 5-Section Report + Test Snippet]

Examples

Quality Gate

MCP Dependencies

@upstash/context7-mcp: Library documentation and examples.
@modelcontextprotocol/server-sequential-thinking: Complex reasoning.

Changelog

Version	Date	Description
1.1.0	2026-03-20	Restructured: examples/references separated, added fields
1.0.0	2026-03-20	Initial release

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Skill: Async/Await Error Tracing

Purpose

Trace and fix async errors including unhandled rejections, missing awaits, and event loop blocking.

Input

Variable

Type

Req

Description

tech_stack

string

Yes

e.g., "Node.js + Express"

error_message

string

Yes

e.g., "UnhandledPromiseRejection"

code

string

Yes

Async logic section

context

string

Yes

Op flow and error expectations

Instructions

Classification: Identify type (Unhandled rejection, missing await, swallowing, loop blocking, forEach async, race).

Trace: Map execution path from creation to rejection and catch sites.

Remediation:

Wrap awaits in try/catch.
Ensure proper error propagation and re-throwing.
Add contextual logging.

Config: Provide settings for better stack traces (e.g., --async-stack-traces).

Validation: Write test snippets verifying propagation (e.g., expect(...).rejects.toThrow()).

Fallback: If no code, provide execution model descriptions and diagnostic templates.

Edge Cases

Case

Strategy

Async in forEach

Recommend Promise.all(array.map(...)) for sequential/parallel handling.

Event Loop Block

Recommend worker threads or setImmediate for heavy computation.

Intermittent Race

Add diagnostic logs around promise settlement points.

Tracing Flow

flowchart TD A[Parse inputs] --> B{Code available?} B -- No --> C[Describe async execution model] C --> D[Provide diagnostic template + tracing tools] B -- Yes --> E[Classify Async Error Type] E --> F[Trace Error Flow] F --> G[Apply Fix: try/catch + propagation + logging] G --> H[Improve async stack trace config] H --> I[Write test verifying error propagation] D --> J[Output: Diagnostic Path] I --> K[Output: 5-Section Report + Test Snippet]

Examples

Quality Gate

MCP Dependencies

@upstash/context7-mcp: Library documentation and examples.

@modelcontextprotocol/server-sequential-thinking: Complex reasoning.

Changelog

Version

Date

Description

1.1.0

2026-03-20

Restructured: examples/references separated, added fields

1.0.0

2026-03-20

Initial release