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 skills/leadmagic/gtm-skills/tool-selection-stacknpx skills add LeadMagic/gtm-skills --skill tool-selection-stackgit clone --depth 1 https://github.com/LeadMagic/gtm-skillsWhat 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 | $0.00115 | $0.01581 |
| Opus 5 | $0.00057 | $0.00790 |
| Sonnet 5 | $0.00023 | $0.00316 |
| Haiku 4.5 | $0.00012 | $0.00158 |
Grade A, and why
tool-selection-stack 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 — 144 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Tool Selection & Stack Builder
Overview
Choosing GTM tools is the most expensive decision most teams make — not because tools are expensive, but because the wrong stack wastes months of productivity. This skill builds stage-appropriate tool stacks with cost breakdowns and clear rationale for every choice.
Automation strategy: Load references/gtm-automation-expert-playbook.md (Jen Igartua)
for maturity assessment before adding tools. Clay = enrichment; n8n = orchestration;
Cargo category = persistent routing at scale — see playbook decision matrix.
Authoritative Foundations
- Jen Igartua (Go Nimbly) — Must-have basics / performance boosters / delighters stack layering — Must-have basics / performance boosters / delighters stack layering
- Jesse Ouellette Lean Stack — Named methodology governing recommendations in this skill's process.
- Eric Nowoslawski Agency Stack — Cold email infra at scale — 2 inboxes/domain, backup inboxes, Creative Ideas testing.
- HubSpot Academy — CRM Automation — Lifecycle stages, object model, and workflow enrollment patterns.
When to Use
- "What tools do I need for cold email?"
- "Build my GTM stack"
- "Compare [Tool A] vs [Tool B]"
- "What should I buy at $X MRR?"
- "Audit my current tool stack"
- "Optimize our tool spend"
Step-by-Step Process
Phase 1: Stage Assessment
Determine the user's stage: Solo Founder (<$10K MRR), Small Team ($10-50K MRR), Growth ($50K-2M ARR), Scale ($2-10M ARR), Enterprise ($10M+).
Phase 2: Stack by Stage
Solo Founder ($100-150/mo):
| Tool | Purpose | Cost |
|---|---|---|
| Apollo | Data + sequencing (all-in-one) | $59/mo |
| LeadMagic | Email verification and finding | Free tier → paid |
| Google Workspace (1-2 inboxes) | Sending | $12/mo |
| Calendly | Scheduling | Free |
Small Team ($400-600/mo):
| Tool | Purpose | Cost |
|---|---|---|
| Clay | Enrichment orchestration | $149/mo |
| Smartlead or Instantly | Sequencing | $33-97/mo |
| LeadMagic | Verification + enrichment | Pay-per-use |
| LinkedIn Sales Nav | Prospecting | $99/mo |
| HubSpot (free) | CRM | Free |
| 3-5 domains + Google inboxes | Sending infra | $75-150/mo |
What ships with it
3 files 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.
- 2d ago First seen · 144 lines · 115 tokens per session scan A 002104916fd7
tool-selection-stack is a skill published in the GitHub repository LeadMagic/gtm-skills (46 stars, last pushed 1mo ago), licensed MIT. It adds 115 tokens to every session and 1,581 once invoked, about $0.0006 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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