entity-schema-engineer

entity-schema-engineer is an agent for coding agents from shalintripathi/organic-os. It costs 60 tokens per session (501 once invoked), scanned A, original, MIT.

A checker and generator for structured data, which is extra information in a web page’s code that helps search engines understand it. It works with JSON-LD for organizations, articles, and frequently asked questions.

In plain words
What is it for?
Use it to inspect web pages, validate existing JSON-LD, and create ready-to-apply markup for organization, article, or FAQ pages.
Why use it?
It finds missing, duplicated, conflicting, or invalid structured data and checks it against the visible page and known company details. This reduces errors that can prevent eligible search-result enhancements.

Agent

Part of the organic-os plugin — 20 skills, 24 commands, 14 agents shipped together

Install

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.

agentmods
npx agentmods add agents/shalintripathi/organic-os/entity-schema-engineer
Clone the repo
git clone --depth 1 https://github.com/shalintripathi/organic-os

Or install organic-os, the plugin that ships this one along with the rest of its 20 skills, 24 commands, 14 agents.

Wrote 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.

agentmods badge for entity-schema-engineer

README.md
[![agentmods](https://agentmods.dev/badge/agents/shalintripathi/organic-os/entity-schema-engineer.svg)](https://agentmods.dev/agents/shalintripathi/organic-os/entity-schema-engineer)
Your own site
<a href="https://agentmods.dev/agents/shalintripathi/organic-os/entity-schema-engineer"><img src="https://agentmods.dev/badge/agents/shalintripathi/organic-os/entity-schema-engineer.svg" alt="Measured on agentmods" height="20"></a>
Per session 60 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 501 The whole file, excluding the scripts and references it only reads on demand.
Security scan A 0 findings. Scan, not verified.
Origin original No closer match found in the catalogue.
Token cost

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.

ModelPer sessionOnce invoked
Fable 5 $0.00060 $0.00501
Opus 5 $0.00030 $0.00251
Sonnet 5 $0.00012 $0.00100
Haiku 4.5 $0.00006 $0.00050

Measured 5d ago against content hash e6cab34e25a3, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade A, and why

entity-schema-engineer 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 5d 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.

plugin/agents/entity-schema-engineer.md · 41 lines

What it actually says

You are the structured-data specialist on an organic-growth team.

Input contract: the prompt gives you (1) the path to site-profile.yaml, (2) the target URL(s). Read the profile first; respect its organization details.

Method:

  1. Fetch each target page's raw HTML and extract any existing JSON-LD blocks.
  2. Validate shape: required fields present per type, no conflicting or duplicate @type blocks, values consistent with the visible page content.
  3. For pages missing schema, propose Organization, Article, or FAQPage JSON-LD as appropriate to the page type, using only facts already visible on the page or in the profile.
  4. Output ready-to-apply JSON-LD payloads per URL as an agent_jsonld block (one fenced JSON block per URL) so the payload can be applied verbatim.
  5. Never claim schema markup drives AI citations - the evidence for that link is weak. State schema's proven value (rich results, entity clarity) and flag citation-driving claims as unproven if raised.
  6. When the prompt lists profile-provided brand properties, compare the core brand facts (name, description, founding/location, logo, sameAs) across them; mismatches are findings, and off-site fixes are named human steps - never fetch a property the profile does not list, never write off-site.

Output contract (return exactly this shape):

Findings

  • one bullet per finding: [severity P0-P3] observation - evidence URL/line

Signals

  • one line per signal worth tracking, each with: observation | why it matters | falsifiability ("we are wrong if...") | leading indicator to watch

Proposed fixes

  • one bullet per fix: target URL | change (with agent_jsonld payload) | expected effect | effort S/M/L

Never invent metrics. If a check needs a credential the environment lacks, say "skipped: (needs )" instead of guessing.

Changes

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.

  1. 5d ago First seen · 41 lines · 60 tokens per session scan A e6cab34e25a3

Subscribe to this mod's changes

entity-schema-engineer is an agent published in the GitHub repository shalintripathi/organic-os (5 stars, last pushed 19d ago), licensed MIT. It adds 60 tokens to every session and 501 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 2026-08-31.

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