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 synthesisengineering/synthesis-skills --skill synthesis-concise-messaginggit clone --depth 1 https://github.com/synthesisengineering/synthesis-skillsWrote 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/synthesisengineering/synthesis-skills/synthesis-concise-messaging)<a href="https://agentmods.dev/skills/synthesisengineering/synthesis-skills/synthesis-concise-messaging"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-concise-messaging/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/synthesisengineering/synthesis-skills/synthesis-concise-messaging"><img src="https://agentmods.dev/badge/skills/synthesisengineering/synthesis-skills/synthesis-concise-messaging.svg" alt="Reviewed on agentmods" width="80" height="20"></a>- NVIDIA SkillSpector pass
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 | $0.00078 | $0.01183 |
| Opus 5 | $0.00039 | $0.00592 |
| Sonnet 5 | $0.00016 | $0.00237 |
| Haiku 4.5 | $0.00008 | $0.00118 |
Grade A, and why
synthesis-concise-messaging 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 9d 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 — 182 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Concise Messaging
Condense messages to 5 sentences or less using the High-Five Habit framework. Most messages can and should be this concise.
Core Principles
The High-Five Habit
Primary Constraint: Most messages should be 5 sentences or less.
Supporting Principles
- Communication Method: If condensation seems forced or loses critical nuance, suggest phone/meeting instead
- Reflection Built-In: By requesting AI assistance, you have already implemented the pause principle
- Distribution Strategy: Recipient limits and timing remain your strategic choices
- Urgency Assessment: Response expectations stay under your control
Communication Philosophy
- Constraints force clarity: Brevity demands precision
- Clarity is kindness: Respect others' time through conciseness
- Every unnecessary word is time theft: Each word should earn its place
- Mirror professional tone: Match the recipient's communication style while improving clarity
Message Structure Templates
Standard Business Email
- Context/Purpose: Why you are writing
- Key Information: Main point or request
- Action Item: What you need from them
- Timeline: When you need it
- Next Step: Clear call to action
Meeting Request
- Context/Purpose of meeting
- Specific topic or agenda focus
- Suggested time options
- Expected duration
- Clear call to action for confirmation
Project Update
- Current status summary
- Key accomplishment or milestone
- Main blocker or challenge (if any)
- Next steps planned
- Timeline or deadline
Introduction/Outreach
- Who you are and context
- Why you are reaching out
- Specific request or offer
- Mutual benefit or value proposition
- Clear next step
Platform-Specific Guidelines
- Start directly with purpose (skip "I hope this finds you well")
- Use clear subject lines that indicate action needed
- End with specific next steps
- Maintain professional tone while being concise
What ships with it
1 file beside SKILL.md in the same directory: the scripts, references and assets a skill reads on demand. Not counted in the per-session cost; read them before you install if any of them is executable.
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.
- 9d ago First seen · 182 lines · 78 tokens per session scan A 3d567b14b9bd
synthesis-concise-messaging is a skill published in the GitHub repository synthesisengineering/synthesis-skills (18 stars, last pushed 2d ago), licensed Apache-2.0. It adds 78 tokens to every session and 1,183 once invoked, about $0.0004 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.
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