gof-memento SKILL.md skillA
gof-memento from robsonkades/agent-skills is an agent skill: a SKILL.md folder an AI agent loads when a task calls for it.
mdr add robsonkades/agent-skills/gof-memento@git:20260927.9ecadfdPins git:20260927.9ecadfd in mdr.lock. Pin the fingerprint instead.
- Audit grade
- A, 17 of 17 checks passed
- Kind
- SKILL.md skill
- Repository
- robsonkades/agent-skills
- Path
skills/gof-memento/SKILL.md- Versions recorded
- 5
- Latest version
- git:20260927.9ecadfd, committed Sep 27, 2026
- First version recorded
- Sep 3, 2026
- Size
- 14,062 bytes
- Repository stars
- 3
- License
- Apache-2.0
Memento in modern Java: capturing an object's state so it can be restored later, without exposing that state to whoever holds the capture. Covers the encapsulation techniques Java offers, why immutable state can be retained by reference behind an appropriate boundary, the memory cost of an undo stack and the alternatives (inverses, diffs, structural sharing), the torn capture when the source mutates mid-copy, and the distinction from a durable snapshot and from event sourcing. Use when undo…
Collected from public GitHub. Every version is saved exactly as it was and never changes. Install it at an exact version with the mdr tool, and every file is checked before it reaches your agent. The main file is checked against the SHA-256 fingerprint recorded here, and the others against the fingerprints GitHub keeps for its source commit. The automatic checks below grade the latest version, and the same checks always give the same file the same grade.
What the file says
# Memento ## Purpose Let something outside an object hold that object's past state without being able to read or corrupt it. The caretaker keeps the capture and hands it back; only the originator understands what is inside. That opacity is the pattern, and it is what a `getState()`/`setState()` pair is not: exposing the state as a public structure lets holders inspect it, depend on its shape and, if mutable, change it, which is the coupling the pattern exists to prevent. Start with the consumer's undo/recovery operation and existing history. Establish which state is restorable, who may hold or apply a capture, whether restore overwrites intervening edits, and which external facts must remain true. Reuse existing observations and budgets; ask only about missing ownership, conflict or recovery requirements that change the design. Inspect the project's compiler release/toolchain and state ownership before changing the API. Examples are partial Java 17 snippets (records and sealed types, no preview); imports, domain types and mutators are omitted. Keep the project baseline rather than upgrading it for a pattern. ## Memento, snapshot, event sourcing ```text …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/gof-memento@sha256:7e6b2f60fbf967a5The line at the top of this page pins the label git:20260927.9ecadfd, which is what most people want. This one pins the sha256 fingerprint of the contents instead, so it survives a label being moved. Either way the exact version is written to mdr.lock, and mdr install downloads and checks those contents again, so it installs them exactly or stops with an error.
[](https://markdownregistry.com/a/art_pdky6bjs3kbhnwbz)
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Versions
The registry has recorded 5 versions of this file, between Sep 3, 2026 and Sep 27, 2026, about one every 6 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20260927.9ecadfd latest | 2026-09-27 | 9ecadfd | 14,062 B | A | view · diff |
| git:20260923.832673e | 2026-09-23 | 832673e | 12,958 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 12,596 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 11,502 B | A | view · diff |
| git:20260903.f199530 | 2026-09-03 | f199530 | 10,437 B | A | view |
Audit of the latest version
- pass: Frontmatter block present
- pass: Frontmatter declares a name
- pass: Frontmatter declares a description
- pass: Size between 200 bytes and 200 KB (14062 bytes)
- pass: No zero-width or bidi control characters
- pass: No instruction hidden inside an HTML comment
- pass: No link to an exfiltration or paste host
- pass: No credential-shaped string
- pass: No instruction to send local credentials anywhere
- pass: No text hidden with inline styles
- pass: No prompt-injection phrasing
- pass: No curl or wget piped into a shell
- pass: No recursive delete of root, home or parent
- pass: No instruction to read or print local credentials
- pass: No base64 blob over 200 characters
- pass: No link to a raw IP address
- pass: No script tag
Source
robsonkades/agent-skills · 3 stars · license Apache-2.0 · pushed 2026-10-28 · branch main
API
GET https://markdownregistry.com/api/v1/artifacts/art_pdky6bjs3kbhnwbz GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/gof-memento GET https://markdownregistry.com/api/v1/blob/7e6b2f60fbf967a52241a8fcd8361884a55624645bb3cb963d8371672f2e81da
Your AI assistant does the legwork. You hear about the deals worth your word. Hand yours the standing instructions at modelranch.com and it joins the network that reads files like this one.
Guides: the SKILL.md format and its required fields · what to check before you install a skill · how to pin a skill to an exact version · where to find agent skills · keeping a team on the same skills · which agent file does what.