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 vinzscam/backstage-skills --skill creating-backstage-catalog-providergit clone --depth 1 https://github.com/vinzscam/backstage-skillsWrote 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/vinzscam/backstage-skills/creating-backstage-catalog-provider)<a href="https://agentmods.dev/skills/vinzscam/backstage-skills/creating-backstage-catalog-provider"><img src="https://agentmods.dev/badge/skills/vinzscam/backstage-skills/creating-backstage-catalog-provider/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/vinzscam/backstage-skills/creating-backstage-catalog-provider"><img src="https://agentmods.dev/badge/skills/vinzscam/backstage-skills/creating-backstage-catalog-provider.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 | $0.00098 | $0.01113 |
| Opus 5 | $0.00049 | $0.00557 |
| Sonnet 5 | $0.00020 | $0.00223 |
| Haiku 4.5 | $0.00010 | $0.00111 |
Grade A, and why
creating-backstage-catalog-provider 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 11d 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 — 59 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Creating a Backstage Catalog Provider
When to use this skill
- Building a module that ingests catalog entities from an external source (Azure DevOps, GitHub topic search, internal asset registry, JSON file, etc.)
- Editing an existing
catalog-backend-module-*plugin - The ingestion runs periodically (provider model) — for one-shot processing of an entity definition file, write a
CatalogProcessorinstead
What you build
A catalog provider is a backend module (createBackendModule({ pluginId: 'catalog', ... })) that registers a provider against an extension point. There are two provider models — pick based on data volume.
Choose the model first: normal vs incremental
Use normal EntityProvider when... |
Use IncrementalEntityProvider when... |
|---|---|
| Total entity count is small (~hundreds at most) | Total entity count is large (thousands+) |
| The full set fits in memory comfortably | Holding the full set in memory is impractical |
| The source returns the full snapshot in one round-trip (or a handful) | The source supports pagination — cursor / page-token / offset / etc. |
| You're prototyping or building a POC | You're shipping for production-scale catalogs |
| Refresh frequency is low | High write rate or scale; incremental handles batching, backoff, retry |
The two models register against different extension points and have different runtime semantics:
- Normal registers against
catalogProcessingExtensionPointfrom@backstage/plugin-catalog-node. Adopters need no extra install. - Incremental registers against
incrementalIngestionProvidersExtensionPointfrom@backstage/plugin-catalog-backend-module-incremental-ingestion. Adopters must also installcatalogModuleIncrementalIngestionEntityProvider(the framework module that orchestrates batches and persists cursors via the catalog database).
What ships with it
2 files 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.
- 11d ago First seen · 59 lines · 98 tokens per session scan A 117d5b3a0224
creating-backstage-catalog-provider is a skill published in the GitHub repository vinzscam/backstage-skills (4 stars, last pushed 16d ago), licensed Apache-2.0. It adds 98 tokens to every session and 1,113 once invoked, about $0.0005 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 2026-08-31.
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