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 mitchellOpZero/sn-advisor/plugin install advisorWrote 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/mitchellopzero/sn-advisor/sn-instance-readonly)<a href="https://agentmods.dev/skills/mitchellopzero/sn-advisor/sn-instance-readonly"><img src="https://agentmods.dev/badge/skills/mitchellopzero/sn-advisor/sn-instance-readonly/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/mitchellopzero/sn-advisor/sn-instance-readonly"><img src="https://agentmods.dev/badge/skills/mitchellopzero/sn-advisor/sn-instance-readonly.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 | $0.00023 | $0.00576 |
| Opus 5.5 | $0.00009 | $0.00230 |
| Sonnet 5.5 | $0.00005 | $0.00115 |
| Haiku 4.5 | $0.00002 | $0.00058 |
Grade A, and why
sn-instance-readonly 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 6d 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 — 103 lines — stays where its author put it; the contents beside it link to each section on GitHub.
ServiceNow Instance Read-Only Context
Use this skill when advisor output would be materially improved by checking live instance context.
First apply ${CLAUDE_PLUGIN_ROOT}/references/configuration-policy.md. If the
activation mode does not permit this run, or instance_readonly.enabled is
false, do not discover auth profiles or contact an instance.
Access model
Use ServiceNow SDK auth profiles only.
Expected profile discovery:
npx @servicenow/sdk auth --list
Use the configured default alias if present. Otherwise ask the user which alias to use. The selected profile's ServiceNow ACLs are the access boundary.
Hard guardrails
- GET/read only.
- No POST, PUT, PATCH, DELETE.
- No deploy.
- No build/publish side effects.
- No fix scripts.
- No background scripts.
- ServiceNow ACLs and the selected SDK auth profile determine what can be read.
- Any table and any readable field may be queried when useful for the task.
- Do not maintain an advisor-owned table denylist by default.
- Do not redact field values by default; trust ServiceNow ACLs and the selected profile.
- Respect max record limits.
Useful context by task
Upgrade:
- instance version/build
- active plugins
- upgrade history
- skipped updates
- relevant system properties
- modified OOB records where safely visible
UX:
- UI-related system properties
- user preferences for UI15/UI16/Next Experience
- active themes/branding
- homepages/dashboards
- workspaces
- portals
- UI scripts, UI macros, UI pages
- client scripts and UI policies
ITSM/table process:
- table dictionary
- business rules
- client scripts
- UI policies
- ACLs
- assignment rules
- flows/workflows
- notifications
- SLAs
Catalog:
- catalog item
- variables and variable sets
- catalog client scripts
- catalog UI policies
- flows/workflows
- approvals
- portals where exposed
Security:
- ACLs
- roles/groups metadata
- table hierarchy
- before-query business rules
- user criteria
Integrations:
- REST messages metadata
- scripted REST APIs
- MID Server status/config
- scheduled imports
- transform maps
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.
- 6d ago Changed · +6 lines e97e1a4dd178
- 1mo ago First seen · 97 lines · 23 tokens per session scan A 29d647319c84
sn-instance-readonly is a skill published in the GitHub repository mitchellOpZero/sn-advisor (3 stars, last pushed 7d ago), licensed MIT. It adds 23 tokens to every session and 576 once invoked, about $0.0001 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 2026-08-31.
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