debug-session

A step-by-step debugging workflow for investigating an error, finding its root cause, and planning or applying a fix.

In plain words
What is it for?
Use it to investigate specific errors, reproduce failures, trace execution, identify affected components, create regression tests, and document prevention steps.
Why use it?
It replaces guesswork with checks of the environment, code paths, input data, logs, database state, and recent changes.

Command for Claude Code

Install

Getting it into your agent

One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.

agentmods
npx agentmods add commands/oxygen-fragment/claude-modular/debug-session
Clone the repo
git clone --depth 1 https://github.com/oxygen-fragment/claude-modular

Made for: Claude Code.

Per session 0 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 603 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

What it costs to keep this loaded

Counted locally with the o200k_base tokenizer, which is exact for GPT models; Claude uses its own tokenizer and its counts differ. Treat this as one consistent yardstick across the catalogue rather than a bill. Prices are per million input tokens.

ModelPer sessionOnce invoked
Fable 5 $0.00000 $0.00603
Opus 5 $0.00000 $0.00302
Sonnet 5 $0.00000 $0.00121
Haiku 4.5 $0.00000 $0.00060

Measured 3d ago against content hash 370f5b86e1ab, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

debug-session scanned grade A with 0 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 3d ago.

A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.

Nothing flagged

None of the 26 patterns this scan looks for appear in this file: no shell pipes, no recursive deletes, no credential paths, no hidden text, no instruction-override or anti-refusal phrasing, no agent-config snooping. That is not a guarantee, it is the absence of the things that are checkable.

.claude/commands/development/debug-session.md · 97 lines

What it actually says

Debug Session Command

2. **Environment Investigation**
   - Check environment variables and configuration
   - Verify dependency versions
   - Analyze system resources and limits
   - Review recent changes and deployments

3. **Code Analysis**
   - Trace code execution paths
   - Identify potential null pointer/undefined access
   - Check boundary conditions and edge cases
   - Review error handling and logging

4. **Data Analysis**
   - Examine input data and parameters
   - Validate data types and formats
   - Check database state and queries
   - Analyze network requests and responses

5. **Root Cause Identification**
   - Isolate the minimal reproduction case
   - Identify the exact failure point
   - Determine underlying cause
   - Assess impact and affected components

6. **Resolution Strategy**
   - Develop fix implementation plan
   - Create test cases for the issue
   - Implement monitoring and prevention
   - Document lessons learned
# Interactive debugging:
# - Error analysis
# - Log investigation
# - Code tracing
# - Solution implementation
```

```bash
# Debug specific error with context
/dev:debug-session --error="NullPointerException" --context="user-login"

# Focused debugging:
# - Specific error type analysis
# - Contextual code review
# - Targeted fix implementation
```

```bash
# Debug performance issue
/dev:debug-session --type=performance --metric=response-time

# Performance debugging:
# - Profiling analysis
# - Bottleneck identification
# - Optimization recommendations
# - Performance testing
```
Changes

What this file has done since we first saw it

Hashed on every crawl. A supply-chain change to an agent config is a question of when, not whether, so the history is kept rather than the latest state alone.

  1. 3d ago First seen · 97 lines · 0 tokens per session scan A 370f5b86e1ab

Subscribe to this mod's changes

debug-session is a command published in the GitHub repository oxygen-fragment/claude-modular (283 stars, last pushed 1y ago), licensed MIT. It costs nothing until one of its globs matches a file; then it loads 603 tokens. A static security scan graded it A with 0 findings. No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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