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.
git clone --depth 1 https://github.com/AlphaBitCore/nexus-gatewayWrote 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/rules/alphabitcore/nexus-gateway/nrn-builder-canonical)<a href="https://agentmods.dev/rules/alphabitcore/nexus-gateway/nrn-builder-canonical"><img src="https://agentmods.dev/badge/rules/alphabitcore/nexus-gateway/nrn-builder-canonical.svg" alt="Measured on agentmods" 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 | $0.00000 | $0.00474 |
| Opus 5 | $0.00000 | $0.00237 |
| Sonnet 5 | $0.00000 | $0.00095 |
| Haiku 4.5 | $0.00000 | $0.00047 |
Grade A, and why
nrn-builder-canonical 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 7d 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
NRN builder is canonical (binding)
iamMW(action) builds the request NRN as nrn := iam.BuildRequestNRNForAction(action, c). The builder owns the action → resourceType derivation. Never hardcode the resourceType string in handler glue — hardcoded strings drift from the IAM catalog and produce silent 403s.
Memory anchor: [[project_iam_resource_nrn_bug]].
Required
e.GET("/api/admin/providers/:id", h.GetProvider, iamMW("admin:provider.read"))
// inside iamMW:
nrn := iam.BuildRequestNRNForAction(action, c) // <- canonical builder
Forbidden
// ❌ hardcoded resource-type
nrn := fmt.Sprintf("nrn:nexus:provider:%s:%s", orgID, id)
// ❌ ad-hoc string concat
nrn := "nrn:nexus:" + getResourceType(action) + ":" + scope + ":*"
Even when the hardcoded version "looks right", it skips the catalog lookup in packages/shared/identity/iam/catalog_data.go. When the catalog updates (new resource, renamed verb), the canonical builder picks it up; hardcoded strings rot.
When the action is new
- Add the action to
packages/shared/identity/iam/catalog_data.go. - Build via
iam.BuildRequestNRNForAction(action, c). - Verify with the
simulatorIAM page in the dashboard.
When the action signature changes
BuildRequestNRNForAction is the single seam. Update the catalog; every handler that uses the builder picks up the change automatically.
Related
- IAM impact review (5-step audit) →
iam-impact-review.mdc. - Architecture:
docs/developers/architecture/services/control-plane/iam-identity-architecture.md. - Skill:
.claude/skills/iam-impact-review/.
Skipping this rule requires explicit user approval in chat.
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.
- 7d ago First seen · 52 lines · 0 tokens per session scan A d1d9d6f15d6e
nrn-builder-canonical is a cursor rule published in the GitHub repository AlphaBitCore/nexus-gateway (23 stars, last pushed 5d ago), licensed Apache-2.0. It costs nothing until one of its globs matches a file; then it loads 474 tokens. 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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