Borrowing it
Nothing to install: this file belongs to NimbleBrainInc/synapse. 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/NimbleBrainInc/synapse/main/CLAUDE.mdgit clone --depth 1 https://github.com/NimbleBrainInc/synapseWrote 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/instructions/nimblebraininc/synapse/claude-md)<a href="https://agentmods.dev/instructions/nimblebraininc/synapse/claude-md"><img src="https://agentmods.dev/badge/instructions/nimblebraininc/synapse/claude-md/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/instructions/nimblebraininc/synapse/claude-md"><img src="https://agentmods.dev/badge/instructions/nimblebraininc/synapse/claude-md.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 | $0.04684 | $0.04684 |
| Opus 5.5 | $0.01874 | $0.01874 |
| Sonnet 5.5 | $0.00937 | $0.00937 |
| Haiku 4.5 | $0.00468 | $0.00468 |
Grade A, and why
synapse CLAUDE.md 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 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.
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.
How it starts
The opening of the file, as written. The whole thing — 289 lines — stays where its author put it; the contents beside it link to each section on GitHub.
@nimblebrain/synapse
Agent-aware app SDK for the MCP ext-apps protocol (2026-01-26).
Verification
npm run ci # lint → typecheck → build → size budget → test
npm run conformance # our wire behaviour, against the spec's own implementation
Run npm run ci before declaring any change complete. No exceptions.
conformance is deliberately not part of npm run ci: it drives real
Chromium, so folding it in would make the documented verification command fail
on a fresh clone until someone ran npx playwright install chromium. CI runs
both as separate jobs. Run it by hand whenever you touch a transport, a
handshake, an adapter, or the preview host — see conformance/README.md for
what it covers and how to add a row.
Re-vendor the Python client asset whenever the build output moves. The
trigger is not "a change under src/host/": the bundle reaches outside it —
src/host/adapters/mcpapps.ts imports from src/detection.ts, and
src/host/theme.ts from src/theme-defaults.ts — and esbuild assigns minified names across the whole output, so deleting an
unrelated export from a module it touches re-mangles the bundle at an unchanged
size. Diff it rather than reasoning about which files matter, and never take a
byte count as evidence the bundle is unchanged. The build writes
dist/synapse-ui.iife.global.js; the copy the Python package ships is a
committed file that nothing updates for you:
npm run build && cp dist/synapse-ui.iife.global.js python/nimblebrain_synapse/_assets/synapse-ui.iife.js
CI's build job diffs the two, and the conformance suite runs the vendored
copy — so a forgotten re-vendor shows up as a conformance failure describing
behaviour you already fixed.
Testing UI components — what the test DOM cannot see
happy-dom drops every CSS declaration whose value contains var(...), shorthand and
longhand alike. background: var(--color-background-secondary, #fafafa) leaves the element
with no background in the rendered style attribute, and so does
border-bottom-color: var(--c, #eee). Vendor-prefixed properties (-webkit-line-clamp) are
dropped too, as are values it does not model (display: -webkit-box).
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 Changed · +5 lines · +72 tokens per session 3652c441b478
- 23d ago Changed · +11 tokens per session 92e48a8c5163
- 1mo ago Changed · -52 lines · -583 tokens per session scan C → A 59ed1526bf8b
- 1mo ago Changed · -6 lines · -21 tokens per session c638bfb02d10
- 1mo ago Changed · +2 lines · +44 tokens per session 9192516ea5df
- 1mo ago Changed · +1 lines · +10 tokens per session 2cff22eafb92
- 1mo ago Changed · +15 lines · +320 tokens per session f5021e9d83e2
- 1mo ago Changed · +64 lines · +884 tokens per session 46492598a7c2
- 1mo ago Changed · +5 lines · +100 tokens per session c5e73917ce9c
- 1mo ago First seen · 255 lines · 3,847 tokens per session scan C 836826f846b8
synapse CLAUDE.md is an instructions file published in the GitHub repository NimbleBrainInc/synapse (2 stars, last pushed 5d ago), licensed MIT. It adds 4,684 tokens to every session, about $0.0187 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.
synapse CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| synapse CLAUDE.mdNimbleBrainInc/synapse | Instructions file | 2 | 5d ago | MIT | A | 4,684 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |