What is immunization-status-checker?

A tool that compares a patient's vaccination history with CDC schedules for adults and children. It also considers documented conditions, allergies, pregnancy, and immune status when checking recommendations.

It helps review vaccine status and optionally create an ImmunizationRecommendation FHIR resource with suggested vaccinations.

It helps reveal overdue or upcoming vaccines and possible contraindications without manually comparing records with immunization schedules.

immunization-status-checker — Skill by langcare/langcare-mcp-fhir

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.

Any agent

npx skills add langcare/langcare-mcp-fhir --skill immunization-status-checker

Clone the repo

git clone --depth 1 https://github.com/langcare/langcare-mcp-fhir

Made for: Claude Code, Codex.

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.

README.md

[![agentmods](https://agentmods.dev/badge/skills/langcare/langcare-mcp-fhir/immunization-status-checker/github.svg)](https://agentmods.dev/skills/langcare/langcare-mcp-fhir/immunization-status-checker)

Your own site

<a href="https://agentmods.dev/skills/langcare/langcare-mcp-fhir/immunization-status-checker"><img src="https://agentmods.dev/badge/skills/langcare/langcare-mcp-fhir/immunization-status-checker/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.

Your own site · 80×15

<a href="https://agentmods.dev/skills/langcare/langcare-mcp-fhir/immunization-status-checker"><img src="https://agentmods.dev/badge/skills/langcare/langcare-mcp-fhir/immunization-status-checker.svg" alt="Reviewed on agentmods" width="80" height="20"></a>

Per session 122 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.

When invoked 3,444 The whole file, excluding the scripts and references it only reads on demand.

Security scan A 0 findings. A grade says what 26 rules found in the file — not that it is safe.

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.

Model	Per session	Once invoked
Fable 5.1	$0.00122	$0.03444
Opus 5.5	$0.00049	$0.01378
Sonnet 5.5	$0.00024	$0.00689
Haiku 4.5	$0.00012	$0.00344

Measured 2mo ago against content hash b6ef35914d9d, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

immunization-status-checker 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 2mo 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.

skills/core/population-health/immunization-status-checker/SKILL.md · 307 lines

How it starts

The opening of the file, as written. The whole thing — 307 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Immunization Status Checker

Overview

Retrieve a patient's Immunization history from FHIR, compare against CDC-recommended immunization schedules (adult and pediatric), identify overdue and upcoming vaccinations, evaluate contraindications based on documented conditions and allergies, and optionally generate an ImmunizationRecommendation FHIR resource. See references/adult-immunization-schedule.md and references/pediatric-immunization-schedule.md for full schedule details, CVX codes, and contraindication criteria.

FHIR Resources Used

Resource	Purpose	Key Fields
Immunization	Vaccination history	vaccineCode, occurrenceDateTime, status, patient, protocolApplied
ImmunizationRecommendation	Generated vaccine recommendations	recommendation[].vaccineCode, dateCriterion, forecastStatus
Patient	Age, sex for schedule determination	birthDate, gender
Condition	Contraindications, risk group identification	code, clinicalStatus
AllergyIntolerance	Vaccine component allergies	code, reaction, clinicalStatus
Observation	Pregnancy status, immune status labs	code, valueQuantity, effectiveDateTime

Instructions

Step 1: Retrieve Patient Demographics

Tool: fhir_read
resourceType: "Patient"
id: "[patient-id]"

Extract birthDate (calculate age in years, months, days for pediatric precision), gender. Determine schedule type: pediatric (age < 19) or adult (age >= 19).

Step 2: Pull Immunization History

Tool: fhir_search
resourceType: "Immunization"
queryParams: "patient=[patient-id]&status=completed&_sort=-date&_count=100"

For each Immunization resource, extract:

vaccineCode.coding -- match CVX code (system http://hl7.org/fhir/sid/cvx)
occurrenceDateTime -- administration date
protocolApplied[].doseNumberPositiveInt -- dose number in series
protocolApplied[].seriesString or seriesDosesPositiveInt -- series name and total doses

Build a vaccine history table: Vaccine Name | CVX Code | Date Given | Dose # | Series.

Read the full file on GitHub · 307 lines

Files

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.

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.

2mo ago First seen · 307 lines · 122 tokens per session scan A b6ef35914d9d

Subscribe to this mod's changes

immunization-status-checker is a skill published in the GitHub repository langcare/langcare-mcp-fhir (71 stars, last pushed 6mo ago), licensed MIT. It adds 122 tokens to every session and 3,444 once invoked, about $0.0005 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 2026-09-03.

Backend and APIs Scientific

immunization-status-checker next to 6 skills from other repositories
Mod	Type	Stars	Last push	Licence	Scan	Tokens	Works with
immunization-status-checkerlangcare/langcare-mcp-fhir	Skill	71	6mo ago	MIT	A	122	Claude Code, Codex
adaptyvK-Dense-AI/scientific-agent-skills	Skill	56k	4d ago	MIT	A	86	Claude Code, Codex
labarchive-integrationK-Dense-AI/scientific-agent-skills	Skill	56k	4d ago	MIT	A	50	Claude Code, Codex
benchling-integrationK-Dense-AI/scientific-agent-skills	Skill	56k	4d ago	MIT	A	50	Claude Code
earth2studio-create-datasourceNVIDIA/skills	Skill	3.9k	yesterday	Apache-2.0	A	53	Claude Code
assembling-fhir-bundlesmaziyarpanahi/openmed	Skill	5.8k	yesterday	Apache-2.0	A	131	Claude Code
exporting-bulk-fhirmaziyarpanahi/openmed	Skill	5.8k	yesterday	Apache-2.0	A	151	Claude Code