Getting it into your agent
It runs from inside its repository, so the clone comes first — what it calls does not travel with the file alone.
git clone --depth 1 https://github.com/elbwalker/walkerOSnpx agentmods add skills/elbwalker/walkeros/walkeros-create-sourceWrote 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/elbwalker/walkeros/walkeros-create-source)<a href="https://agentmods.dev/skills/elbwalker/walkeros/walkeros-create-source"><img src="https://agentmods.dev/badge/skills/elbwalker/walkeros/walkeros-create-source/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/elbwalker/walkeros/walkeros-create-source"><img src="https://agentmods.dev/badge/skills/elbwalker/walkeros/walkeros-create-source.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 | $0.00065 | $0.07924 |
| Opus 5.5 | $0.00026 | $0.03170 |
| Sonnet 5.5 | $0.00013 | $0.01585 |
| Haiku 4.5 | $0.00006 | $0.00792 |
Grade A, and why
walkeros-create-source 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 14d 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 — 910 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Create a New Source
Prerequisites
Before starting, read these skills:
- understanding-flow - How sources fit in architecture
- understanding-sources - Source interface
- understanding-transformers - Transformer chaining from sources
- understanding-events - Event structure sources emit
- understanding-mapping - Transform raw input to events
- testing-strategy - How to test with env pattern and dev examples
- using-step-examples -
Authoritative
Flow.StepExamplepattern,createTrigger, Three Type Zones - using-logger - For an HTTP source, see
"Choosing a level on public endpoints": rejected client input is debug or warn
plus a
rejectedcounter and a 4xx, never an error-level log - writing-documentation - Documentation standards (for Phase 9)
Source Types
A source's identity is split into two fields:
| Field | Meaning | Examples |
|---|---|---|
source.type |
The kind of source (its role / mechanism) | browser, dataLayer, cookiefirst, fetch |
source.platform |
The runtime that hosts the source (web, server, app, ...) |
web, server |
| Platform | Input | Example types |
|---|---|---|
web |
DOM events, dataLayer | browser, dataLayer |
server |
HTTP requests, webhooks | gcp, express, lambda, fetch |
What ships with it
11 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.
- examples/index.ts 251 B runs code
- examples/inputs.ts 1.0 KB runs code
- examples/mapping.ts 1.1 KB runs code
- examples/outputs.ts 833 B runs code
- examples/requests.ts 669 B runs code
- templates/server/dev.ts 206 B runs code
- templates/server/index.test.ts 4.2 KB runs code
- templates/server/index.ts 3.5 KB runs code
- templates/server/schemas.ts 543 B runs code
- templates/server/types.ts 465 B runs code
- TESTING.md 1.7 KB
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.
- 14d ago Changed · +6 lines a3acabfee44e
- 1mo ago First seen · 904 lines · 65 tokens per session scan A dec1cadec6d0
walkeros-create-source is a skill published in the GitHub repository elbwalker/walkerOS (348 stars, last pushed 2d ago), licensed MIT. It adds 65 tokens to every session and 7,924 once invoked, about $0.0003 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.
Other skills, from other repositories
implementing-mcp-tools
Guide for exposing PostHog product endpoints as MCP tools. Use when creating new or updating API endpoints, adding MCP tool definitions, scaffolding YAML configs, or writing serializers with good descriptions. Covers the full pipeline from Django serializer to generated TypeScript tool handler.
webiny-api-cms-content-models
Creating Headless CMS content models via code using the ModelFactory pattern. Use this skill when the developer wants to create, modify, or understand content model definitions, define fields and validators, set up reference fields between models, configure field layouts (including nested layouts inside object or…
webiny-form-model
Building forms with the FormModel system — field types, renderers, layout, validation, conditional rules, computed fields, and dynamic zones. Use this skill when the developer needs to define form fields with the builder API, choose renderers, build layouts with tabs/rows/separators, add validation (Zod or…
webiny-api-permissions
Schema-based permission system for API features. Use this skill when implementing authorization in use cases, defining permission schemas with createPermissionSchema, creating injectable permissions via createPermissionsAbstraction/createPermissionsFeature, checking read/write/delete/publish permissions, handling…
webiny-event-handler-pattern
EventHandler implementation pattern — handle method, event payloads, filtering, DI, domain event definition, publishing events from UseCases, and reacting to external events. Use this skill to implement any Webiny EventHandler (before/after hooks) or to define and publish your own domain events.
nextjs-app-router
Full end-to-end tRPC setup for Next.js App Router. Covers route handler with fetchRequestHandler (GET + POST exports), TRPCProvider with QueryClientProvider, createTRPCOptionsProxy for RSC prefetching, HydrateClient/HydrationBoundary for hydration, useSuspenseQuery for Suspense, and server-side callers.