gof-observer SKILL.md skillA
gof-observer 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-observer@git:20261028.082d2f4Pins git:20261028.082d2f4 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-observer/SKILL.md- Versions recorded
- 5
- Latest version
- git:20261028.082d2f4, committed Oct 28, 2026
- First version recorded
- Sep 3, 2026
- Size
- 14,073 bytes
- Repository stars
- 3
- License
- Apache-2.0
Observer in Java: choosing and reviewing in-process listener contracts for ordering, errors, threads, registration lifetime, reentrancy and notification outside locks. Use when adding listeners, investigating retained listeners or missed callbacks, or assessing a move from local notifications to a broker. Covers migration contract changes; detailed transaction/outbox design belongs to event-driven-architecture, broker guarantees to delivery-semantics, demand protocols to reactive-backpressure…
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
# Observer ## Purpose Let a subject tell an unknown set of dependents that something happened, without depending on them. It is the most reached-for decoupling mechanism in object design and the one whose contract is most often over-read. The abstract pattern does not itself choose ordering, thread, error isolation, lifecycle or crash delivery. A concrete observer API must choose them; even “registered observers are called” needs qualification for concurrent deregistration, filtering and failure policy. Use Java 17 as the baseline for the partial examples here (no preview). Inspect actual compiler, Spring/Guava/Modulith versions, multicaster/executor configuration and transaction manager before applying framework-specific guidance; no upgrade is implied. Return the concrete dispatch and lifecycle contract, evidence for it, and tests or explicit unverified cases. Start from the caller's operation and its listeners' required effects, using existing tests, registration owners, transaction configuration and recovery arrangements. Ask only about material gaps such as tolerated loss, callback completion or ordering. Preserve an adequate local mechanism; …
Read the whole file at its exact version.
How to install
mdr add robsonkades/agent-skills/gof-observer@sha256:177edb94277bac9cThe line at the top of this page pins the label git:20261028.082d2f4, 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_gi6lpnrhipb4ohg3)
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Versions
The registry has recorded 5 versions of this file, between Sep 3, 2026 and Oct 28, 2026, about one every 14 days.
| version | committed | commit | size | audit | |
|---|---|---|---|---|---|
| git:20261028.082d2f4 latest | 2026-10-28 | 082d2f4 | 14,073 B | A | view · diff |
| git:20260927.9ecadfd | 2026-09-27 | 9ecadfd | 13,843 B | A | view · diff |
| git:20260911.37b054b | 2026-09-11 | 37b054b | 13,166 B | A | view · diff |
| git:20260906.e6ad4bd | 2026-09-06 | e6ad4bd | 11,649 B | A | view · diff |
| git:20260903.f199530 | 2026-09-03 | f199530 | 11,091 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 (14073 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_gi6lpnrhipb4ohg3 GET https://markdownregistry.com/api/v1/resolve?ref=robsonkades/agent-skills/gof-observer GET https://markdownregistry.com/api/v1/blob/177edb94277bac9cec964c0bcd8f87cbde07882166435b2b262b57221dcb7eb6
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.