Borrowing it
Nothing to install: this file belongs to vvedantb/eva. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/vvedantb/eva/main/.agents/skills/clerk-backend-api/SKILL.mdgit clone --depth 1 https://github.com/vvedantb/evaWrote 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/vvedantb/eva/clerk-backend-api)<a href="https://agentmods.dev/skills/vvedantb/eva/clerk-backend-api"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/clerk-backend-api/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/vvedantb/eva/clerk-backend-api"><img src="https://agentmods.dev/badge/skills/vvedantb/eva/clerk-backend-api.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 | $0.00042 | $0.04196 |
| Opus 5.5 | $0.00017 | $0.01678 |
| Sonnet 5.5 | $0.00008 | $0.00839 |
| Haiku 4.5 | $0.00004 | $0.00420 |
Grade D, and why
clerk-backend-api scanned grade D with 3 findings against 26 rules in 11 categories — prompt injection, anti-refusal, data exfiltration, privilege escalation, supply chain, agent snooping, system-prompt leakage, SSRF and excessive agency — measured 1mo ago.
A static scan of the body, not an audit. Every finding is printed with the line that produced it so you can judge whether it matters here. A mod is markdown that instructs an agent; that is exactly why what it instructs is worth reading.
Sends data to an external URLmediumData exfiltration
A POST to an outside endpoint may be telemetry or may be exfiltration; either way the mod talks to somewhere, and you should know where.
curl -s "https://api.clerk.com/v1/users?limit=100&offset=0&order_by=-created_at&created_at=gt:$(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" \ 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:
-
Check CLERK_SECRET_KEY — verify it is set:
echo $CLERK_SECRET_KEY | head -c 10If empty, stop and ask the user. Do not proceed without a valid key.
-
Check CLERK_BAPI_SCOPES — run:
echo $CLERK_BAPI_SCOPESInspect 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.
-
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.
-
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))"
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.
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.
- 1mo ago First seen · 456 lines · 42 tokens per session scan D 5e07e0c79852
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 5.5. 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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