Canonical Copilot Collections is a repository for organizing and distributing GitHub Copilot instructions, prompts, agents, and skills across Canonical repositories. Teams configure repositories to subscribe to shared collections, such as Python, documentation, or Juju development guidance, and keep those assets synchronized.
Getting it into your agent
One page per mod, every tool's command on it. A separate URL per tool would split the same page into five that compete with each other.
npx skills add canonical/copilot-collections --skill documentation-stylegit clone --depth 1 https://github.com/canonical/copilot-collectionsWrote 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/canonical/copilot-collections/documentation-style)<a href="https://agentmods.dev/skills/canonical/copilot-collections/documentation-style"><img src="https://agentmods.dev/badge/skills/canonical/copilot-collections/documentation-style/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/canonical/copilot-collections/documentation-style"><img src="https://agentmods.dev/badge/skills/canonical/copilot-collections/documentation-style.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00042 | $0.00599 |
| Opus 5.5 | $0.00017 | $0.00240 |
| Sonnet 5.5 | $0.00008 | $0.00120 |
| Haiku 4.5 | $0.00004 | $0.00060 |
Grade A, and why
documentation-style 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 1mo ago.
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 — 75 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Documentation Style Review
Scope
Style conformance only: tone, voice, terminology, punctuation, Oxford comma, active versus passive voice, prohibited phrases, and formatting conventions.
Inputs
- Documentation file(s) under review.
- Normative style asset:
references/doc-style-guide.md. - Syntax-specific style guides (fetched at runtime):
- MyST:
https://raw.githubusercontent.com/canonical/sphinx-docs-starter-pack/refs/heads/main/docs/reference/myst-syntax-reference.md - reST:
https://raw.githubusercontent.com/canonical/sphinx-docs-starter-pack/refs/heads/main/docs/reference/rst-syntax-reference.rst
- MyST:
Actions
-
Load style guides: Read
references/doc-style-guide.md. Fetch the syntax-specific guide matching the file type (MyST for.md, reST for.rst). -
Syntax compliance: Check headings, lists, code blocks, inline literals, and directives against the applicable syntax guide. Treat every instruction in the guide as mandatory; do not rely on a subset of rules.
-
Full style guide compliance: Read and apply all rules defined in
references/doc-style-guide.md. Treat every instruction in the guide as mandatory; do not rely on a subset of rules. -
Style guide citation: For every violation found, locate and quote the specific passage in
references/doc-style-guide.mdor the syntax-specific guide that supports the finding. -
Fallback behaviour: If syntax guides cannot be fetched (offline or network blocked), continue the review using
references/doc-style-guide.mdand the syntax patterns already present in the documentation set.If
references/doc-style-guide.mdis unavailable, STOP the review and report that the style guide cannot be accessed. -
Verification:
Confirm the style review completed:
- Style guides loaded (doc-style-guide.md and syntax-specific guide if available)
- Syntax compliance checked against applicable guide
- Style guide compliance checked against all rules in doc-style-guide.md
- All violations cited with quoted passages from style guides
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 1mo ago First seen · 75 lines · 42 tokens per session scan A 53910266335e
documentation-style is a skill published in the GitHub repository canonical/copilot-collections (31 stars, last pushed 7d ago), licensed Apache-2.0. It adds 42 tokens to every session and 599 once invoked, about $0.0002 per session on Opus 5.5. 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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