Legal & ComplianceAvailable

File Evidence Seal

Computes SHA-256 for a directory and every file in it, writing a manifest with timestamps and sizes plus an overall rootHash. The manifest can later be used to re-verify the directory, distinguishing added, removed, content-modified and mtime-only changes — a changed timestamp alone is not reported as tampering. Intended for evidence preservation, delivery records and backup verification.

Installfile-evidence-seal-skill

Capabilities

Recursive SHA-256 computation with a manifest file

Re-verification: added / removed / modified / mtime-only

Overall rootHash, usable as a sync gate

Skips .DS_Store / Thumbs.db by default, --exclude supported

Specifications

Use cases

Evidence preservation

Roles

LegalOps

Runtime

No third-party deps

Offline

Fully offline

Data boundary

Data stays local

Package

file-evidence-seal-skill

How to install

Skill packages follow the open Agent Skills standard (one directory plus a SKILL.md). No request or licence is needed. Pick whichever path matches your client, then just describe the task in chat to trigger it.

① Import the package

Recommended

Download the skill zip and load it from your client's "import / upload local skill package" entry. If SKILL.md sits at the top level of the archive, the package is well formed.

Download packageCurrent version v1.0.0

② Command line

For command-line clients that support the Agent Skills standard: one command syncs the skill into your local skills directory.

$npx skills add m9ai/m9ai-skills --skill file-evidence-seal-skill

Pass -a to name the client (claude-code, codex); omit it and you will be asked which one to use.

③ Unzip manually

You can also unzip the archive straight into your client's skills directory - no installer to run. The zip is self-contained and can be distributed offline, which makes it easy to host on an internal file server for company-wide rollout.

WorkBuddySettings → Skills directory (as shown in the client)

Claude Code (user level)~/.claude/skills/

Claude Code (project level).claude/skills/

Other clients supporting the Agent Skills standard work the same way: drop the skill directory into their skills folder.

Need this inside your own systems?

Ready-made skills cover generic scenarios. Internal data sources, private models and compliance requirements call for a tailored build.

See custom services