Borrowing it
Nothing to install: this file belongs to nylas/cli. 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/nylas/cli/main/CLAUDE.mdgit clone --depth 1 https://github.com/nylas/cliWrote 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/nylas/cli/claude-md)<a href="https://agentmods.dev/instructions/nylas/cli/claude-md"><img src="https://agentmods.dev/badge/instructions/nylas/cli/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/nylas/cli/claude-md"><img src="https://agentmods.dev/badge/instructions/nylas/cli/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 | $0.01451 | $0.01451 |
| Opus 5.5 | $0.00580 | $0.00580 |
| Sonnet 5.5 | $0.00290 | $0.00290 |
| Haiku 4.5 | $0.00145 | $0.00145 |
Grade D, and why
cli CLAUDE.md scanned grade D with 2 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.
Asks for rootmediumPrivilege escalation
A mod that escalates privileges can change anything on the machine, not only the project.
- Go build cache corruption: `sudo rm -rf ~/.cache/go-build ~/go/pkg/mod && go clean -cache` Recursive force deletehighDestructive command
rm -rf with a variable or a broad path is one typo away from removing the wrong tree.
- Go build cache corruption: `sudo rm -rf ~/.cache/go-build ~/go/pkg/mod && go clean -cache` How it starts
The opening of the file, as written. The whole thing — 112 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Nylas CLI — AI Assistant Rules
Every line traces to a real mistake. If Claude does it correctly without the instruction, delete it.
Working Principles
- Think Before Coding — State assumptions explicitly. If uncertain, ask. Push back when a simpler approach exists. Stop when confused — name what's unclear.
- Goal-Driven Execution — Define success criteria before starting. Loop until verified. Don't follow steps blindly — iterate toward success.
- Simplicity First — Minimum code that solves the problem. No speculative features. No abstractions for single-use code.
- Surgical Changes — Touch only what you must. Clean up only your own mess. Don't "improve" adjacent code or refactor what isn't broken.
- Read Before You Write — Before adding code, read exports, callers, shared utilities. "Looks orthogonal" is dangerous — this is the root cause of most LEARNINGS below. If unsure why code is structured that way, ask.
- Match Conventions — Conformance > taste. If you disagree with a convention, surface it — don't fork silently.
- Surface Conflicts, Don't Blend — If two patterns contradict, pick one (more recent / more tested). Explain why. Flag the other for cleanup.
- Tests Verify Intent — Tests encode WHY behavior matters, not just WHAT it does. A test that can't fail when business logic changes is wrong. Never modify existing tests to make implementation pass — fix the implementation instead.
- Checkpoint After Significant Steps — Summarize what was done, what's verified, what's left. If you lose track, stop and restate.
- Fail Loud — "Completed" is wrong if anything was skipped. "Tests pass" is wrong if any were skipped. Surface uncertainty, don't hide it.
Critical Rules
NEVER: commit secrets (.env, keys, tokens) · skip tests · skip security scans · skip linting · create files >600 lines
ALWAYS run before commits:
make ci-full # Complete CI: quality + tests + cleanup
make ci # Quick: fmt → vet → lint → test-unit → test-race → security → vuln → build
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 · 112 lines · 1,451 tokens per session scan D 414aea4b4b72
cli CLAUDE.md is an instructions file published in the GitHub repository nylas/cli (76 stars, last pushed 12d ago), licensed MIT. It adds 1,451 tokens to every session, about $0.0058 per session on Opus 5.5. A static security scan graded it D with 2 findings (asks for root, recursive force delete). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-30.
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