# Parallel Debugging

> >

- **Type:** Skill
- **Install:** `agentstack add skill-acaprino-claude-code-daodan-parallel-debugging`
- **Verified:** Yes — security-reviewed for prompt injection and unsafe behavior
- **Seller:** [acaprino](https://agentstack.voostack.com/s/acaprino)
- **Installs:** 0
- **Category:** [Agent Skills](https://agentstack.voostack.com/c/agent-skills)
- **Latest version:** 0.1.0
- **License:** MIT
- **Upstream author:** [acaprino](https://github.com/acaprino)
- **Source:** https://github.com/acaprino/claude-code-daodan/tree/master/plugins/agent-teams/skills/parallel-debugging

## Install

```sh
agentstack add skill-acaprino-claude-code-daodan-parallel-debugging
```

Requires the [AgentStack CLI](https://agentstack.voostack.com/docs/cli). Works with Claude Code, Cursor, and any MCP-compatible agent.

## About

# Parallel Debugging

Framework for debugging complex issues using the Analysis of Competing Hypotheses (ACH) methodology with parallel agent investigation.

## When to Use This Skill

- Bug has multiple plausible root causes
- Initial debugging attempts haven't identified the issue
- Issue spans multiple modules or components
- Need systematic root cause analysis with evidence
- Want to avoid confirmation bias in debugging

## Hypothesis Generation Framework

Generate hypotheses across 6 failure mode categories:

### 1. Logic Error

- Incorrect conditional logic (wrong operator, missing case)
- Off-by-one errors in loops or array access
- Missing edge case handling
- Incorrect algorithm implementation

### 2. Data Issue

- Invalid or unexpected input data
- Type mismatch or coercion error
- Null/undefined/None where value expected
- Encoding or serialization problem
- Data truncation or overflow

### 3. State Problem

- Race condition between concurrent operations
- Stale cache returning outdated data
- Incorrect initialization or default values
- Unintended mutation of shared state
- State machine transition error

### 4. Integration Failure

- API contract violation (request/response mismatch)
- Version incompatibility between components
- Configuration mismatch between environments
- Missing or incorrect environment variables
- Network timeout or connection failure

### 5. Resource Issue

- Memory leak causing gradual degradation
- Connection pool exhaustion
- File descriptor or handle leak
- Disk space or quota exceeded
- CPU saturation from inefficient processing

### 6. Environment

- Missing runtime dependency
- Wrong library or framework version
- Platform-specific behavior difference
- Permission or access control issue
- Timezone or locale-related behavior

## Evidence Collection Standards

### What Constitutes Evidence

| Evidence Type     | Strength | Example                                                         |
| ----------------- | -------- | --------------------------------------------------------------- |
| **Direct**        | Strong   | Code at `file.ts:42` shows `if (x > 0)` should be `if (x >= 0)` |
| **Correlational** | Medium   | Error rate increased after commit `abc123`                      |
| **Testimonial**   | Weak     | "It works on my machine"                                        |
| **Absence**       | Variable | No null check found in the code path                            |

### Citation Format

Always cite evidence with file:line references:

```
**Evidence**: The validation function at `src/validators/user.ts:87`
does not check for empty strings, only null/undefined. This allows
empty email addresses to pass validation.
```

### Confidence Levels

| Level               | Criteria                                                                            |
| ------------------- | ----------------------------------------------------------------------------------- |
| **High (>80%)**     | Multiple direct evidence pieces, clear causal chain, no contradicting evidence      |
| **Medium (50-80%)** | Some direct evidence, plausible causal chain, minor ambiguities                     |
| **Low (`. Investigators write directly with the `Write` tool rather than returning the report only as message text.

Reference: `docs/references/agent-teams-best-practices.md` § Operational do's and don'ts.

## Source & license

This open-source skill is cataloged on AgentStack and links to its original source — we do not rehost the code.

- **Author:** [acaprino](https://github.com/acaprino)
- **Source:** [acaprino/claude-code-daodan](https://github.com/acaprino/claude-code-daodan)
- **License:** MIT

Install and usage instructions live in the source repository linked above.

## Pricing

- **Free** — Free

## Security capabilities

Automated source analysis of v0.1.0 — what this tool can access:

- **Network access:** no
- **Filesystem access:** no
- **Shell / process execution:** no
- **Environment & secrets:** no
- **Dynamic code execution:** no

*"Yes" means the capability is present in the source — more access means more to trust, not that it is unsafe.*


## Versions

- **0.1.0** — security scan: passed — Imported from the upstream source.

## Links

- Listing page: https://agentstack.voostack.com/l/skill-acaprino-claude-code-daodan-parallel-debugging
- Seller: https://agentstack.voostack.com/s/acaprino
- Browse the marketplace: https://agentstack.voostack.com/browse

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