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prime-silo: Agent for Claude Code

.claude/agents/board-sonnet.md

board-sonnet is an agent for Claude Code from binary16labs/prime-silo. It costs 43 tokens per session (402 once invoked), scanned A, original, MIT.

An AI agent role for implementing clearly specified software tasks on a delivery board. TDD, or test-driven development, means writing a failing test first, then implementing the change until the test passes.

In plain words
What is it for?
Use it for specified layout and CSS changes, API endpoints, live event connections, test suites and verification scripts.
Why use it?
It gives well-defined work a fixed process, limited file scope and explicit checks before completion.

Agent for Claude Code

Written for Claude Code: installed under .claude/. Also seen: model in frontmatter; reads .claude/ paths.

This is binary16labs/prime-silo's own configuration. It tells Claude Code how to work on prime-silo itself, so it is not a mod to install elsewhere. Copy it as a starting point and replace the rules that are about this project. Everything prime-silo configures →

not rated 5repo 13d ago A scan 43 tokens original MIT
View source ↗ binary16labs/prime-silo binary16labs.github.io
Reuse

Borrowing it

Nothing to install: this file belongs to binary16labs/prime-silo. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.

Copy the file
curl -O https://raw.githubusercontent.com/binary16labs/prime-silo/main/.claude/agents/board-sonnet.md
Clone the repo
git clone --depth 1 https://github.com/binary16labs/prime-silo

Made for: Claude Code.

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 board-sonnet

README.md
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Your own site
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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.

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Your own site · 80×15
<a href="https://agentmods.dev/agents/binary16labs/prime-silo/board-sonnet"><img src="https://agentmods.dev/badge/agents/binary16labs/prime-silo/board-sonnet.svg" alt="Reviewed on agentmods" width="80" height="20"></a>
Per session 43 Only the description is in the session, so the agent can decide to use it. The body loads when it is invoked.
When invoked 402 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.

ModelPer sessionOnce invoked
Fable 5.1 $0.00043 $0.00402
Opus 5.5 $0.00017 $0.00161
Sonnet 5.5 $0.00009 $0.00080
Haiku 4.5 $0.00004 $0.00040

Measured 2mo ago against content hash f83b484148c8, method: parsed. Prices are Anthropic first-party input rates as of 2026-10-07, from the pricing page.

Security

Grade A, and why

board-sonnet 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.

.claude/agents/board-sonnet.md · 30 lines

What it actually says

You are claude-sonnet, a contract executor on the Prime-Silo delivery board.

Before anything else, read these files IN FULL and obey them exactly:

  1. delivery/README.md (the law)
  2. .claude/skills/delivery-board/SKILL.md (mechanics, worktree recipe, gate craft, traps)
  3. If your contract touches user-facing UI: .claude/skills/prime-silo-experience/SKILL.md
  4. If your contract animates anything: .claude/skills/animejs-scrollcraft/SKILL.md

Then read ONLY your task contract (delivery/tasks/<ID>.md). It contains everything: goal, allowlist, verify command, acceptance scenarios. If it is insufficient, log blocked: contract insufficient — <what's missing> and stop — that is the correct outcome, not a failure.

Non-negotiables:

  • TDD order: failing test/gate FIRST (watch it fail), then implement, then green, then refactor.
  • One task at a time (WIP 1). Claim on the board before working. Never move your own task to DONE.
  • sandbox: worktree means work in a git worktree per the skill's recipe (outside OneDrive).
  • Stage files by name; never git add -A; never touch .env, scratch/, logs/, unrelated WIP.
  • Two strikes on the same failure → log blocked with the exact error and stop.
  • Your final report states: scenarios covered, gate output (verbatim exit status), files changed vs allowlist, budget used, and anything you skipped — honestly.
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. 2mo ago First seen · 30 lines · 43 tokens per session scan A f83b484148c8

Subscribe to this mod's changes

board-sonnet is an agent published in the GitHub repository binary16labs/prime-silo (5 stars, last pushed 13d ago), licensed MIT. It adds 43 tokens to every session and 402 once invoked, about $0.0002 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 2026-08-31.

Building agentsa2aagent-harnessagent-osagent-to-agentbinary16local-first
Related

board-sonnet compared with agents from other repositories

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