Claude Octopus is an orchestration project that sends research, design, and coding tasks to Claude Code and other AI model providers so their results can be compared. Developers use it for multi-model work, disagreement detection, reviews, persistent context, and an optional workflow that moves from discovery through delivery. The catalogue entries are its commands, skills, agents, instructions, hooks, plugins, and settings.
Getting it into your agent
This one installs as part of its plugin. Adding the marketplace and installing the plugin brings it with everything else the plugin ships.
/plugin marketplace add nyldn/claude-octopus/plugin install octoWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/skills/nyldn/claude-octopus/skill-authoring)<a href="https://agentmods.dev/skills/nyldn/claude-octopus/skill-authoring"><img src="https://agentmods.dev/badge/skills/nyldn/claude-octopus/skill-authoring/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/skills/nyldn/claude-octopus/skill-authoring"><img src="https://agentmods.dev/badge/skills/nyldn/claude-octopus/skill-authoring.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.00030 | $0.01694 |
| Opus 5 | $0.00015 | $0.00847 |
| Sonnet 5 | $0.00006 | $0.00339 |
| Haiku 4.5 | $0.00003 | $0.00169 |
Grade A, and why
skill-authoring 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 — 166 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Skill Authoring
Load skills/blocks/engineering-method-selection.md from the installed plugin
and apply only the methods relevant to this task. Preserve this entry point's
execution contract and output format. Read referenced skills as instructions;
do not invoke the current command recursively or add provider calls from a seat.
Domain language
Load skills/blocks/domain-modeling.md when a skill discusses providers, models,
access, billing, reviewers, or votes. Reuse the shared definitions instead of
inventing local synonyms. State the source and time of observations. Never infer
authentication, entitlement, billing mode, quota, or model-family independence
from a binary or transport name alone.
A skill exists to get determinism out of a stochastic system. Predictability is the goal, and it means the agent takes the same process every run — not that it produces the same output. Every rule below serves that.
docs/PLUGIN-ASSEMBLY-STANDARD.md already fixes the structure a skill body
should take. This is about what makes the content inside that structure work.
Adapted from writing-great-skills in
mattpocock/skills (MIT), with the
invocation section rewritten for how this plugin actually loads skills.
When To Use
- Writing a new skill, or reviewing one in a PR.
- A skill fires when it should not, or fails to fire when it should.
- A skill behaves differently run to run on the same input.
- Deciding whether something should be a skill at all, or a command, or prose in
CLAUDE.md.
When Not To Use
- For the mechanical checklist — file layout, registration, required sections.
That is
docs/PLUGIN-ASSEMBLY-STANDARD.mdand the CI suites. - For writing prompts that are not skills. That is
skill-meta-prompt.
Inputs
The skill under construction or review, and an honest answer to: what should the agent do differently because this exists?
Workflow
Invocation: explicit by default
Every shipped command and skill carries disable-model-invocation: true.
Claude Code therefore keeps Octopus out of model context until the user chooses
an /octo:* command. This is a hard platform gate, not a prose reminder.
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 Changed · +13 lines 664244f50ed5
- 9d ago First seen · 153 lines · 30 tokens per session scan A 0fcbd89bf48e
skill-authoring is a skill published in the GitHub repository nyldn/claude-octopus (4,056 stars, last pushed yesterday), licensed MIT. It adds 30 tokens to every session and 1,694 once invoked, about $0.0002 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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