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 agentmods add instructions/rust-works/succinctly/claude-mdgit clone --depth 1 https://github.com/rust-works/succinctlyWhat 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 | $0.17995 | $0.17995 |
| Opus 5 | $0.08997 | $0.08997 |
| Sonnet 5 | $0.03599 | $0.03599 |
| Haiku 4.5 | $0.01800 | $0.01800 |
Grade A, and why
succinctly 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 2d 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 — 846 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md
This file provides guidance to Claude Code (claude.ai/code) when working with code in this repository.
Skills Reference
Detailed guidance is organized into skills in .claude/skills/. Claude will auto-invoke these based on context:
| Skill | Triggers | Purpose |
|---|---|---|
| benchmark-docs | "benchmark", "update benchmarks" | Platform-specific benchmark documentation |
| markdown-tables | "format table", "align table" | Fixed-width table formatting |
| simd-optimization | "SIMD", "AVX", "NEON", "vectorization" | SIMD patterns and learnings |
| bit-optimization | "rank", "select", "popcount", "lookup table" | Bit-level optimization patterns |
| json-semi-indexing | "JSON index", "semi-index", "cursor" | JSON parsing implementation details |
| yaml-semi-indexing | "YAML index", "YAML parser", "sequence item" | YAML parsing and debugging patterns |
| testing | "test", "assert", "coverage", "regression" | Test quality patterns and anti-patterns |
| commit-msg | "commit message", "amend commit" | Conventional commits format |
| knowledge-map | "knowledge map", "wiki", "update wiki" | Maintain docs/ knowledge wiki |
| skill-writing | "create skill", "SKILL.md", "write skill" | Best practices for writing Claude skills |
Knowledge Wiki
A structured knowledge base for this codebase lives in docs/. Start at docs/index.md for a concept-oriented map of how the data structures, algorithms, SIMD implementations, and benchmarks relate to each other. The wiki pages cross-link to existing architecture docs, parsing docs, source files, and academic papers.
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.
- 2d ago First seen · 846 lines · 17,995 tokens per session scan A 6065dd901285
succinctly CLAUDE.md is an instructions file published in the GitHub repository rust-works/succinctly (51 stars, last pushed 2d ago), licensed MIT. It adds 17,995 tokens to every session, about $0.0900 per session on Opus 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 2026-08-30.
Other instructions, from other repositories
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Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
next.js AGENTS.md
Instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.