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.
npx skills add BlockRunAI/blockrun-mcp --skill decidegit clone --depth 1 https://github.com/BlockRunAI/blockrun-mcpWrote 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/blockrunai/blockrun-mcp/decide)<a href="https://agentmods.dev/skills/blockrunai/blockrun-mcp/decide"><img src="https://agentmods.dev/badge/skills/blockrunai/blockrun-mcp/decide/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/blockrunai/blockrun-mcp/decide"><img src="https://agentmods.dev/badge/skills/blockrunai/blockrun-mcp/decide.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 | $0.00108 | $0.02659 |
| Opus 5.5 | $0.00043 | $0.01064 |
| Sonnet 5 | $0.00022 | $0.00532 |
| Haiku 4.5 | $0.00011 | $0.00266 |
Grade A, and why
decide scanned grade A with 1 finding 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 8d 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
description: "Use when the user wants to try BlockRun's free typed-judgment endpoint (POST api.blockrun.ai/v1/decide, served by OpenJev) on their own data from Claude Code — yes/no, labelled choice, or scored-rung questi How it starts
The opening of the file, as written. The whole thing — 209 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Decide — free typed judgments from Claude Code
POST https://api.blockrun.ai/v1/decide takes a state (a message, a ticket, a
diff, a tool result, a row of data) and up to 64 questions, and returns a typed
answer with a number beside each one. No prose to parse. The backend is
OpenJev, an open-source natural-language-inference model BlockRun hosts.
It is not a BlockRun MCP tool, on purpose: you are already a frontier model,
and for a one-off "is this urgent?" you are the better judge. The endpoint earns
its place when the user wants the same fixed ruler over many items, or is
prototyping a judgment they will later run from a pipeline without a model.
From Claude Code, call it with curl from the shell.
What it is not
- Not paid, not x402. It is free behind a registered API key. There is no
payment header, no wallet path, and it is served by
api.blockrun.ai, not the x402 gateway atblockrun.ai(a POST toblockrun.ai/v1/decideis a 404). - OpenJev is not Jev. Jev is TypeSafe's model. OpenJev is an unaffiliated
open-source NLI cross-encoder (MIT, published by AlexWortega on Hugging Face,
Qwen3.5 4B base). It is not made by the people who make Jev and it is not a
smaller or free tier of it. BlockRun does not sell or resell Jev. There is one
backend, and the
x-blockrun-backendresponse header names it on every call. - No quality comparison exists. BlockRun expects OpenJev to be materially weaker than Jev, has not benchmarked the two, and will not put a number on the gap. Do not invent one. The model authors' own zero-shot NLI figures, with attribution and a read date, are at https://blockrun.ai/openjev.
Getting a key without changing how the MCP pays
Keys are minted at https://user.blockrun.ai/dashboard/keys (brk_live_…,
shown once; registration, not a card).
For experiments, export the key in the shell and leave the MCP server alone:
export BLOCKRUN_API_KEY=brk_live_…
Do not write it to ~/.blockrun/.api-key just to try decide. The MCP
server reads that file at startup and a present key moves every paid tool
from wallet mode to account billing — the same switch BLOCKRUN_API_KEY in the
MCP server's own config makes. That is fine if the user wants account billing
(see the blockrun-setup skill); it is a surprise if they only wanted a free
judgment. If the MCP is already on account billing, the same key works for both.
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.
- 8d ago First seen · 209 lines · 108 tokens per session scan A d3a60da67f35
decide is a skill published in the GitHub repository BlockRunAI/blockrun-mcp (395 stars, last pushed 4d ago), licensed MIT. It adds 108 tokens to every session and 2,659 once invoked, about $0.0004 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-09-21.
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