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 skills/elbwalker/walkeros/walkeros-understanding-sourcesnpx skills add elbwalker/walkerOS --skill walkeros-understanding-sourcesgit clone --depth 1 https://github.com/elbwalker/walkerOSWrote 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-understanding-sources)<a href="https://agentmods.dev/skills/elbwalker/walkeros/walkeros-understanding-sources"><img src="https://agentmods.dev/badge/skills/elbwalker/walkeros/walkeros-understanding-sources.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 | $0.00037 | $0.04834 |
| Opus 5 | $0.00018 | $0.02417 |
| Sonnet 5 | $0.00007 | $0.00967 |
| Haiku 4.5 | $0.00004 | $0.00483 |
Grade A, and why
walkeros-understanding-sources 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 — 498 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Understanding walkerOS Sources
Overview
Sources capture events from the external world (browser DOM, dataLayer, HTTP requests, cloud functions) and feed them to the collector.
Core principle: Sources capture. They don't process or deliver—that's collector and destinations.
Source Interface
See packages/core/src/types/source.ts for canonical interface.
Init Function (Context Pattern)
Sources use a context-based initialization pattern:
import type { Source } from '@walkeros/core';
export const sourceMySource: Source.Init<Types> = async (context) => {
const { config = {}, env, logger, id } = context;
// ...
};
Context contains:
| Property | Type | Purpose |
|---|---|---|
config |
Source.Config<T> |
Settings, mapping, options |
env |
Types['env'] |
Environment (push, logger) |
logger |
Logger |
Logging functions |
id |
string |
Source identifier |
collector |
Collector.Instance |
Reference to collector |
withScope |
(scope, respond, body) => Promise<R> |
Bind ingest + respond to a single scope (server sources). Takes a normalized Source.Scope |
Push Method
| Method | Purpose |
|---|---|
push(input) |
Receive external input, emit events |
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 First seen · 498 lines · 37 tokens per session scan A d54d47f1bd2b
walkeros-understanding-sources is a skill published in the GitHub repository elbwalker/walkerOS (343 stars, last pushed 3d ago), licensed MIT. It adds 37 tokens to every session and 4,834 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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