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 richfrem/agent-plugins-skills/plugin install agent-scaffoldersWrote 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/richfrem/agent-plugins-skills/ecosystem-authoritative-sources)<a href="https://agentmods.dev/skills/richfrem/agent-plugins-skills/ecosystem-authoritative-sources"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/ecosystem-authoritative-sources/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/richfrem/agent-plugins-skills/ecosystem-authoritative-sources"><img src="https://agentmods.dev/badge/skills/richfrem/agent-plugins-skills/ecosystem-authoritative-sources.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 | $0.00052 | $0.02137 |
| Opus 5 | $0.00026 | $0.01069 |
| Sonnet 5 | $0.00010 | $0.00427 |
| Haiku 4.5 | $0.00005 | $0.00214 |
Grade A, and why
ecosystem-authoritative-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 — 137 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Dependencies
This skill requires Python 3.8+ and standard library only. No external packages needed.
To install this skill's dependencies:
pip-compile ./requirements.in
pip install -r ./requirements.txt
See ../../requirements.txt for the dependency lockfile (currently empty — standard library only).
Ecosystem Authoritative Sources
Official Open Standard Recognition
Important: This reference library draws heavy inspiration and structural standards directly from the Anthropic Claude Plugins official repositories. Please refer to:
- Foundational Specification:
https://github.com/anthropics/claude-plugins-official/tree/main/plugins/plugin-dev - L4 Interaction & Execution Patterns: Derived from
https://github.com/anthropics/claude-knowledgework-plugins(specifically the Legal and Bio-Research plugins). - Skill Creator 2.0 (Anthropic, March 2026):
https://github.com/anthropics/skills/tree/main/skills/skill-creator - Anthropic Official Claude Code docs:
https://docs.anthropic.com/en/docs/claude-code/
Agentic OS / Agent Harness Pattern
The Agentic OS is a synthesized runtime environment pattern built from Anthropic primitives:
| Component | Anthropic Primitive | Official URL |
|---|---|---|
| Project kernel | CLAUDE.md hierarchy (5 scopes) |
https://docs.anthropic.com/en/docs/claude-code/memory |
| Scheduled tasks | /loop command |
https://docs.anthropic.com/en/docs/claude-code/loop |
| Task specialists | Sub-agents (.claude/agents/) |
https://docs.anthropic.com/en/docs/claude-code/sub-agents |
| Automation | Hooks (hooks.json) |
https://docs.anthropic.com/en/docs/claude-code/hooks |
| Personal shortcuts | Slash commands (.claude/commands/) |
https://docs.anthropic.com/en/docs/claude-code/slash-commands |
| Per-project config | Plugin settings (.claude/*.local.md) |
Anthropic plugin-dev docs |
The context/ folder structure, heartbeat.md, START_HERE.md, and memory log patterns
are community conventions built on top of these primitives (not Anthropic-official).
What ships with it
60 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.
- acceptance-criteria.md 39 B
- assets/resources/plugin-architecture.mmd 51 B
- assets/resources/skill-execution-flow.mmd 52 B
- evals/evals.json 695 B
- evals/results.tsv 301 B
- references/acceptance-criteria.md 42 B
- references/azure-foundry-agents.md 43 B
- references/diagrams/plugin-architecture.mmd 55 B
- references/diagrams/plugin-architecture.png 55 B
- references/diagrams/skill-execution-flow.mmd 56 B
- references/diagrams/skill-execution-flow.png 56 B
- references/fallback-tree.md 36 B
- references/github-agentic-workflows.md 47 B
- references/github-prompts.md 37 B
- references/hooks.md 28 B
- references/index.md 28 B
- references/marketplace.md 34 B
- references/npx-skills.md 33 B
- references/patterns/action-forcing-output-with-deadline-attribution.md 82 B
- references/patterns/adversarial-objectivity-constraint.md 69 B
- references/patterns/anti-pattern-vaccination.md 59 B
- references/patterns/anti-symptom-triage.md 54 B
- references/patterns/artifact-embedded-execution-audit-trail.md 74 B
- references/patterns/artifact-generation-xss-compliance-gate.md 74 B
- references/patterns/artifact-lifecycle.md 53 B
- references/patterns/artifact-state-interrogative-routing.md 71 B
- references/patterns/asynchronous-benchmark-metric-capture.md 72 B
- references/patterns/audience-segmented-information-filtering.md 75 B
- references/patterns/category-calibrated-benchmark-anchoring.md 74 B
- references/patterns/category-semantic-deferred-tool-binding.md 74 B
- references/patterns/chained-command-invocation.md 61 B
- references/patterns/chained-commands.md 51 B
- references/patterns/client-side-compute-sandbox-constraint.md 73 B
- references/patterns/complexity-tiered-output.md 59 B
- references/patterns/conditional-step-inclusion.md 61 B
- references/patterns/connector-placeholders.md 57 B
- references/patterns/cyclical-state-propagation-contract.md 70 B
- references/patterns/delegated-constraint-verification-loop.md 73 B
- references/patterns/dual-mode-degradation.md 56 B
- references/patterns/dual-mode-meta-skill.md 55 B
- references/patterns/dual-register-communication-enforcement.md 74 B
- references/patterns/dynamic-specification-fetching.md 65 B
- references/patterns/embedded-deterministic-scoring-formula.md 73 B
- references/patterns/escalation-taxonomy.md 54 B
- references/patterns/explicit-seed-anchored-determinism.md 69 B
- references/patterns/graduated-autonomy.md 53 B
- references/patterns/graduated-source-attributed-elicitation.md 74 B
- references/patterns/highly-procedural-fallback-trees.md 67 B
- references/patterns/iteration-directory-isolation.md 64 B
- references/patterns/lifecycle-aware-knowledge.md 60 B
- references/patterns/local-interactive-output-viewer-loop.md 71 B
- references/patterns/mandatory-counterfactual-scenario-templating.md 79 B
- references/patterns/mode-invariant-compliance-gate.md 65 B
- references/patterns/multi-actor-operational-coordination-manifest.md 80 B
- references/patterns/multi-dimensional-tone.md 57 B
- references/patterns/multi-modal-routing.md 54 B
- references/patterns/multi-source-synthesis.md 57 B
- references/patterns/multi-variant-trigger-optimizer.md 66 B
- references/patterns/negative-instruction-constraint.md 66 B
- references/patterns/output-classification.md 56 B
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 · 137 lines · 52 tokens per session scan A e5774306d977
ecosystem-authoritative-sources is a skill published in the GitHub repository richfrem/agent-plugins-skills (6 stars, last pushed today), licensed MIT. It adds 52 tokens to every session and 2,137 once invoked, about $0.0003 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 2026-09-03.
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