**Dependencies**: None (foundational skill)

**Standalone usage**: This skill is fully functional standalone. It provides file integrity
verification that other skills in the suite depend on. Install this first when adopting
the Neon Agentic Suite.

**Data handling**: This skill performs local-only operations. Hash computation uses standard
SHA256 algorithms locally — no file contents are sent to any model, API, or external service.
Results are written to `output/context-packets/` in your workspace. The skill reads config from
`.openclaw/context-verifier.yaml` or `.claude/context-verifier.yaml` only.

**File access scope**: This skill reads user-specified files for hash computation. The metadata
declares config and output paths only — the skill will read ANY file path you provide to
`/cv hash`, `/cv verify`, or `/cv packet`. Use caution with sensitive files.

## What This Solves

AI agents sometimes operate on stale data — editing a file that changed since it was read, or trusting cached content that's now outdated. This skill prevents that by:

1. **Computing hashes** of files before and after operations
2. **Detecting changes** between read and write
3. **Generating context packets** with verifiable checksums for review workflows

**The insight**: Trust but verify. The file you read might not be the file you're about to edit. Check first.

## Usage

## Sub-Commands

| Command | CJK | Logic | Trigger |
|---------|-----|-------|---------|
| `/cv hash` | 哈希 | file→SHA256(content) | Explicit |
| `/cv verify` | 検証 | file×hash→match✓∨mismatch✗ | Explicit |
| `/cv tag` | 標記 | file→severity∈{critical,important,minor} | Explicit |
| `/cv packet` | 包装 | files[]→{path,hash,severity,timestamp}[] | Explicit |

## Arguments

### /cv hash

| Argument | Required | Description |
|----------|----------|-------------|
| file | Yes | File path to hash |
| --algorithm | No | Hash algorithm: `sha256` only (MD5/SHA-1 removed - cryptographically broken) |

### /cv verify

| Argument | Required | Description |
|----------|----------|-------------|
| file | Yes | File path to verify |
| hash | Yes | Expected hash value |
| --algorithm | No | Hash algorithm: sha256 only |

### /cv tag

| Argument | Required | Description |
|----------|----------|-------------|
| file | Yes | File path to tag |
| severity | No | Severity level: `critical`, `important`, `minor` (auto-detected if omitted) |

### /cv packet

| Argument | Required | Description |
|----------|----------|-------------|
| files | Yes | Comma-separated file paths or glob pattern |
| --name | No | Packet name (default: auto-generated) |
| --include-content | No | Include file content in packet (default: false) - **see Security section** |

> **⚠️ Security Warning**: The `--include-content` flag stores file contents to disk.
> Never use this flag with sensitive files (`.env`, credentials, secrets).
> See the [Security Considerations](#security-considerations) section below.

## Configuration

Configuration is loaded from (in order of precedence):
1. `.openclaw/context-verifier.yaml` (OpenClaw standard)
2. `.claude/context-verifier.yaml` (Claude Code compatibility)
3. Defaults (built-in patterns)

## Security Considerations

**Local-only processing**: All hash computation uses standard SHA256 algorithms executed locally.
No file contents are ever sent to any LLM, API, or external service. The "agent's model" is only
used to interpret your commands — not to process file contents.

**What this skill does NOT do:**
- Send file contents to any model or API (hashing is local)
- Call external APIs or third-party services
- Modify source files (only writes to `output/context-packets/`)

**What this skill accesses:**
- Configuration files in `.openclaw/context-verifier.yaml` and `.claude/context-verifier.yaml`
- **Any user-specified files** for hash computation (read-only) — the skill reads whatever paths you provide
- Its own output directory `output/context-packets/` (write)

**⚠️ IMPORTANT**: Unlike other skills in this suite, context-verifier reads arbitrary files that
you specify. The metadata only declares config/output paths. When you run `/cv hash myfile.go`,
the skill reads `myfile.go` even though it's not in the metadata. This is by design — verification
requires reading the files you want to verify.

This skill handles file metadata and optionally file contents. Follow these guidelines:

### Sensitive File Detection (Not Reading)

The `critical_patterns` (e.g., `*.env`, `*credentials*`, `*secret*`) are used for:
- **Detection**: Identifying files that should trigger warnings
- **Severity tagging**: Marking files as critical for change-blocking behavior

By default, `/cv hash` and `/cv packet` compute hashes **without reading file contents into output**.
The hash is computed but the file content is not stored.

### --include-content Flag

**⚠️ WARNING**: The `--include-content` flag writes actual file contents to disk.

| Risk | Mitigation |
|------|------------|
| Secrets written to disk | Never use `--include-content` with `.env`, credentials, or secret files |
| Sensitive data in git | Add `output/context-packets/` to `.gitignore` (see below) |
| Data retention | Packets are stored indefinitely; manually delete when no longer needed |

**Recommended usage**:

### Required .gitignore Entry

Add to your `.gitignore` to prevent accidental commits:

### Storage and Retention

- **Location**: Packets stored in `output/context-packets/` (workspace-local)
- **Format**: Unencrypted JSON
- **Retention**: No automatic deletion; clean up manually
- **Access**: Standard filesystem permissions (no additional access controls)

For sensitive environments, consider:
1. Restricting `output/` directory permissions
2. Using encrypted filesystems
3. Periodic cleanup of old packets

### Provenance

This skill is developed by Live Neon (https://github.com/live-neon/skills) and published
to ClawHub under the `leegitw` account. Both refer to the same maintainer.

## Core Logic

### Hash Computation

Default algorithm: SHA-256

### Severity Classification

Files are auto-classified based on configurable patterns:

| Severity | Default Patterns | Behavior on Change |
|----------|------------------|-------------------|
| critical | `*.env`, `*credentials*`, `*secret*`, project config | Block operation |
| important | `*.go`, `*.ts`, `*.md` (in docs/) | Warn user |
| minor | `*.log`, `*.tmp`, `output/*` | Info only |

Critical file patterns are configurable via `.openclaw/context-verifier.yaml`:

## Output

### /cv hash output

> **Note**: Avoid including sensitive files (`.env`, credentials) in packets.
> Use specific globs like `src/*.go` rather than `*` to exclude secrets.

## Integration

- **Layer**: Foundation (no dependencies)
- **Depends on**: None (foundational verification system)
- **Used by**: failure-memory (for file change detection), constraint-engine (for pre-action checks)

## Failure Modes

| Condition | Behavior |
|-----------|----------|
| File not found | Error: "File not found: {path}" |
| Permission denied | Error: "Cannot read file: {path}" |
| Invalid hash format | Error: "Invalid hash format. Expected: {algorithm}" |
| Glob matches no files | Warning: "No files match pattern: {glob}" |

## Next Steps

After invoking this skill:

| Condition | Action |
|-----------|--------|
| Hash mismatch | Alert user, suggest re-read of file |
| Critical file changed | Block operation, require verification |
| Packet created | Store in `output/context-packets/` for audit |

## Workspace Files

This skill reads/writes:

## Examples

### Verify file before editing

# Safe: Hash only (default) - no content stored
/cv packet src/*.go --name "pre-refactor"

# Risky: Content included - ensure no sensitive files in glob
/cv packet docs/*.md --name "docs-backup" --include-content

# NEVER do this:
/cv packet .env --include-content  # Stores secrets to disk!

# .openclaw/context-verifier.yaml
critical_patterns:
  - "*.env"
  - "*credentials*"
  - "*secret*"
  - "CLAUDE.md"     # Claude Code projects
  - "AGENTS.md"     # OpenClaw projects
  - "pyproject.toml" # Python projects
  - "Cargo.toml"    # Rust projects