clerk-backend-api

clerk-backend-api is a skill for Claude Code, Codex from vvedantb/eva. It costs 42 tokens per session (4,196 once invoked), scanned D, original, MIT.

A tool for exploring and calling Clerk’s backend REST API. Clerk is a service that manages users, sign-ins, organizations, and related account data.

In plain words
What is it for?
Use it to list users, manage organizations, inspect endpoint schemas, or make authenticated Clerk API requests.
Why use it?
It provides a way to inspect available API endpoints and their expected data before making a request. It also adds checks around credentials and permissions for changes that modify or delete data.

Skill for Claude CodeCodex

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 skills/vvedantb/eva/clerk-backend-api
Any agent
npx skills add vvedantb/eva --skill clerk-backend-api
Clone the repo
git clone --depth 1 https://github.com/vvedantb/eva

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.

agentmods badge for clerk-backend-api

README.md
[![agentmods](https://agentmods.dev/badge/skills/vvedantb/eva/clerk-backend-api.svg)](https://agentmods.dev/skills/vvedantb/eva/clerk-backend-api)
Your own site
<a href="https://agentmods.dev/skills/vvedantb/eva/clerk-backend-api"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/clerk-backend-api.svg" alt="Measured on agentmods" height="20"></a>
Per session 42 Skills are progressive disclosure: only the name and description are preloaded; the body loads when the skill is used.
When invoked 4,196 The whole file, excluding the scripts and references it only reads on demand.
Security scan D 3 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 $0.00042 $0.04196
Opus 5 $0.00021 $0.02098
Sonnet 5 $0.00008 $0.00839
Haiku 4.5 $0.00004 $0.00420

Measured 5d ago against content hash 5e07e0c79852, method: parsed. Prices are Anthropic first-party input rates as of 2026-08-30, from the pricing page.

Security

Grade D, and why

clerk-backend-api scanned grade D with 3 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.

The scan reads SKILL.md. This mod also ships 5 executable files (scripts/api-specs-context.sh, scripts/execute-request.sh, scripts/extract-endpoint-detail.sh, …), listed below but not scanned — reading those needs a real analyzer, not pattern matching.

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.

Sends data to an external URLmediumData exfiltration

A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.

curl -s "https://api.clerk.com/v1/users?limit=100&offset=0&order_by=-created_at&created_at=gt:$(date -d '7 days ago' +%s 2>/dev/null || date -v-7d +%s)000" \

Downloads and executes remote codehighSupply chain

curl | sh runs whatever the server returns today, which is not necessarily what it returned when this was reviewed.

curl -s https://raw.githubusercontent.com/clerk/openapi-specs/main/bapi/${version_name} | bash scripts/extract-tag-endpoints.sh "${tag_name}"

Makes network callslowCapability

Not a fault in itself. Listed so you know the mod talks to something, and to what.

ORG=$(curl -s -X POST "https://api.clerk.com/v1/organizations" \
.agents/skills/clerk-backend-api/SKILL.md · 456 lines

How it starts

The opening of the file, as written. The whole thing — 456 lines — stays where its author put it; the contents beside it link to each section on GitHub.

Options context

User Prompt: $ARGUMENTS

CRITICAL: Mandatory checks before EVERY write request

Before ANY POST / PATCH / PUT / DELETE, you MUST do ALL of the following in your response:

  1. Check CLERK_SECRET_KEY — verify it is set:

    echo $CLERK_SECRET_KEY | head -c 10
    

    If empty, stop and ask the user. Do not proceed without a valid key.

  2. Check CLERK_BAPI_SCOPES — run:

    echo $CLERK_BAPI_SCOPES
    

    Inspect the output. If scopes are missing or do not include the required write permission, tell the user: "This is a write operation and your current scopes may not allow it. Rerun with --admin to bypass?" Do NOT attempt the request and fail — ask first.

  3. For DELETE requests: warn explicitly that the action is IRREVERSIBLE and list exactly what data will be permanently destroyed (user record, all sessions, all memberships, all associated data). Require explicit confirmation before proceeding. This warning is MANDATORY — never skip it.

  4. For metadata operations: always explain which metadata type is being used and why (see Metadata types section below).


FAST PATH: Common operations (use directly, no spec fetching needed)

For the operations below, skip spec fetching and execute immediately using these exact templates. Substitute $CLERK_SECRET_KEY, $USER_ID, $ORG_ID, $EMAIL as needed from the user's context.

Create organization + invite member (two-step)

# Step 1 — Create organization
ORG=$(curl -s -X POST "https://api.clerk.com/v1/organizations" \
  -H "Authorization: Bearer $CLERK_SECRET_KEY" \
  -H "Content-Type: application/json" \
  -d "{\"name\": \"Acme Corp\", \"created_by\": \"$USER_ID\"}")
echo "$ORG" | python3 -c "import sys,json; d=json.load(sys.stdin); print(json.dumps(d, indent=2))"

# Step 2 — Extract org ID
ORG_ID=$(echo "$ORG" | python3 -c "import sys,json; print(json.load(sys.stdin)['id'])")

# Step 3 — Invite member with role
curl -s -X POST "https://api.clerk.com/v1/organizations/${ORG_ID}/invitations" \
  -H "Authorization: Bearer $CLERK_SECRET_KEY" \
  -H "Content-Type: application/json" \
  -d "{\"email_address\": \"[email protected]\", \"role\": \"org:admin\"}" \
  | python3 -c "import sys,json; print(json.dumps(json.load(sys.stdin), indent=2))"

Read the full file on GitHub · 456 lines

Files

What ships with it

6 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.

  1. 5d ago First seen · 456 lines · 42 tokens per session scan D 5e07e0c79852

Subscribe to this mod's changes

clerk-backend-api is a skill published in the GitHub repository vvedantb/eva (101 stars, last pushed today), licensed MIT. It adds 42 tokens to every session and 4,196 once invoked, about $0.0002 per session on Opus 5. A static security scan graded it D with 3 findings (sends data to an external url, downloads and executes remote code, makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.

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