Fhir API

What it does

When your agent uses it

• Implementing a FHIR server with REST endpoints
• Building a FHIR client
• Designing FHIR API routes and handlers
• Implementing FHIR operations (read

Example prompts

• “FHIR REST”
• “FHIR API”
• “FHIR server”
• “/fhir-api”

Workflow steps

3 steps, taken from the first numbered list in SKILL.md.

1. 1Server returns ETag: W/"[versionId]" with responses
2. 2Client sends If-Match: W/"[versionId]" with updates
3. 3Server returns 412 Precondition Failed if version mismatch

What it can do on your machine

Read from SKILL.md and the folder at commit 56a3b4a. It shows what the files ask for, not the result of running them.

• Tool permissions

  Pre-approves nothing: there is no allowed-tools line, so your agent's usual permission prompts apply.

  From allowed-tools in the SKILL.md frontmatter.

• Runs code

  No scripts in the folder and no shell commands in SKILL.md (its code samples are json).

  From the folder's file list and the shell code blocks in SKILL.md.

• Network

  No URLs in SKILL.md.

  From URLs in SKILL.md, links to its own repository left out.

• Credentials

  Names no API keys, tokens, secrets or passwords.

  From names ending in _API_KEY, _TOKEN, _SECRET, _KEY or _PASSWORD in SKILL.md.

Context cost

Fhir API loads about 1.5k tokens when it runs, and up to ~7.2k if it reads all its reference files. Until then it costs about 159 tokens; SKILL.md has 388 words of instructions outside code blocks.

Always · name and description, kept in context so the agent knows when to use it

~159

When it runs · the whole SKILL.md, loaded when a task matches

~1.5k

With references · SKILL.md plus every file in references/, read only if the agent opens them

~7.2k

Estimates: characters ÷ 4, the usual rule of thumb; real counts depend on the model's tokenizer. Scripts and assets cost tokens only if the agent reads them.

Safety

Automated static check — not a guarantee. Review scripts before installing. It scans the text of SKILL.md for risky patterns (piping downloads into a shell, reading credential files, hidden Unicode, destructive commands); files beside SKILL.md are not scanned.

SKILL.md

The full file from aehrc/pathling at commit 56a3b4a, republished under its Apache-2.0 licence (© aehrc). 388 words, ~1,462 tokens.

name

fhir-api

description

Expert guidance for implementing FHIR RESTful API servers and clients following the HL7 FHIR specification. Use this skill when implementing a FHIR server with REST endpoints, building a FHIR client, designing FHIR API routes and handlers, implementing FHIR operations (read, create, update, delete, search, history), working with FHIR bundles, batch requests, or transactions, handling FHIR content negotiation, headers, and versioning, or implementing conditional operations. Trigger keywords include "FHIR REST", "FHIR API", "FHIR server", "FHIR client", "FHIR endpoint", "FHIR operations", "RESTful FHIR", "implement FHIR".

[base]/[type]/[id]

Accept: application/fhir+json; fhirVersion=4.0

{
    "resourceType": "OperationOutcome",
    "issue": [
        {
            "severity": "error",
            "code": "invalid",
            "diagnostics": "Patient.birthDate: Invalid date format"
        }
    ]
}

© aehrc, Apache-2.0. Rendered from Markdown: HTML in the file is shown as text, images as links, and headings moved down two levels. Raw file

Files

SKILL.md and 3 other files (references) in .claude/skills/fhir-api of aehrc/pathling.

• SKILL.md
• references/batch-transaction.md
• references/operations.md
• references/search.md

Open the folder on GitHubat commit 56a3b4a

Used in 1 other repository

We found 1 copy of this SKILL.md (exact, near-identical or edited) in other folders, from 1 other GitHub owner. This page covers the copy in aehrc/pathling, which our catalogue first saw on October 7, 2026.

• majiayu000/claude-skill-registryskills/api/fhir-api