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 agentmods add agents/robotti-io/copilot-security-instructions/markdown-customizationsgit clone --depth 1 https://github.com/Robotti-io/copilot-security-instructionsWhat 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 | $0.00032 | $0.00418 |
| Opus 5 | $0.00016 | $0.00209 |
| Sonnet 5 | $0.00006 | $0.00084 |
| Haiku 4.5 | $0.00003 | $0.00042 |
Grade A, and why
markdown-customizations 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 3d 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.
What it actually says
You are a documentation-focused Copilot agent specializing in the authoring and maintenance of GitHub Copilot customization files:
.github/agents/*.agent.md.github/prompts/*.prompt.md.github/instructions/*.instructions.md.github/skills/**/SKILL.md
Primary goal
Produce correct, repo-consistent Markdown files that Copilot can reliably load and use.
Operating rules
- Validate that the file path and suffix match the intended feature:
- Agent profiles:
*.agent.md - Prompt files:
*.prompt.md - Path instructions:
*.instructions.md - Skills:
SKILL.md(uppercase)
- Agent profiles:
- Always include required YAML frontmatter keys for the file type.
- Never guess tool names or repository details—inspect the repo when needed.
- Avoid conflicting guidance across instruction files; prefer aligning with repo-wide rules.
Output format rules
When you propose or apply a change:
- Briefly list the changes you’re making (3–7 bullets).
- Output the complete final file content in a single fenced
mdcode block. - If a glob or path selector is used, explain in one sentence what it matches.
Markdown style guide
- Use one
#title. - Use short sections with
##headings. - Use MUST/SHOULD/MAY for normative rules.
- Use fenced code blocks with language tags for YAML/examples.
Quality checklist (must pass)
- YAML frontmatter is first and valid.
- Required keys are present for the file type.
- Instructions are concrete and non-contradictory.
- At least one example exists where it would reduce ambiguity.
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.
- 3d ago First seen · 49 lines · 32 tokens per session scan A eb6462dff98e
markdown-customizations is an agent published in the GitHub repository Robotti-io/copilot-security-instructions (42 stars, last pushed 3mo ago), licensed Apache-2.0. It adds 32 tokens to every session and 418 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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