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.
npx agentmods add skills/sd0xdev/sd0x-harness/code-explorenpx skills add sd0xdev/sd0x-harness --skill code-exploregit clone --depth 1 https://github.com/sd0xdev/sd0x-harnessWhat 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.
| Model | Per session | Once invoked |
|---|---|---|
| Fable 5 | $0.00051 | $0.01149 |
| Opus 5 | $0.00026 | $0.00575 |
| Sonnet 5 | $0.00010 | $0.00230 |
| Haiku 4.5 | $0.00005 | $0.00115 |
Grade A, and why
code-explore 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 yesterday.
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.
How it starts
The opening of the file, as written. The whole thing — 164 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Code Explore Skill
Trigger
- Keywords: code explore, code investigation, research code, trace code, feature understanding, quick investigation, code exploration
When to Use
- Quickly understand how a feature works
- Trace execution paths / data flow
- Diagnose problem root causes
- No dual confirmation needed (no Codex cross-validation)
When NOT to Use
| Scenario | Alternative |
|---|---|
| Need dual confirmation | /code-investigate (Claude + Codex) |
| Git history tracking | /git-investigate |
| System verification | /feature-verify |
| Code review | /codex-review-fast |
Workflow
┌──────────────────────────────────────────────────────────┐
│ Phase 1: Locate Entry Point │
├──────────────────────────────────────────────────────────┤
│ 1. Grep keywords -> find related files │
│ 2. Identify entry points (Controller / Service / Provider) │
│ 3. Build file list │
└──────────────────────────────────────────────────────────┘
↓
┌──────────────────────────────────────────────────────────┐
│ Phase 2: Trace Path │
├──────────────────────────────────────────────────────────┤
│ 1. Start from entry point, Read │
│ 2. Identify dependencies -> continue tracing │
│ 3. Map call chain (A -> B -> C) │
└──────────────────────────────────────────────────────────┘
↓
┌──────────────────────────────────────────────────────────┐
│ Phase 3: Understand Logic │
├──────────────────────────────────────────────────────────┤
│ 1. What is the core logic? │
│ 2. How does data flow? │
│ 3. Error handling mechanisms? │
│ 4. Key decision points? │
└──────────────────────────────────────────────────────────┘
↓
┌──────────────────────────────────────────────────────────┐
│ Phase 4: Output Report │
├──────────────────────────────────────────────────────────┤
│ 1. Architecture overview (diagram / table) │
│ 2. Key files list │
│ 3. Execution flow │
│ 4. Findings / notes │
└──────────────────────────────────────────────────────────┘
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- yesterday First seen · 164 lines · 51 tokens per session scan A 609ec947ef29
code-explore is a skill published in the GitHub repository sd0xdev/sd0x-harness (188 stars, last pushed 2d ago), licensed MIT. It adds 51 tokens to every session and 1,149 once invoked, about $0.0003 per session on Opus 5. 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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