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/aeonfun/aeon/base-mcpnpx skills add aeonfun/aeon --skill base-mcpgit clone --depth 1 https://github.com/aeonfun/aeonWrote 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/aeonfun/aeon/base-mcp)<a href="https://agentmods.dev/skills/aeonfun/aeon/base-mcp"><img src="https://agentmods.dev/badge/skills/aeonfun/aeon/base-mcp.svg" alt="Measured on agentmods" 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 | $0.00042 | $0.01511 |
| Opus 5 | $0.00021 | $0.00756 |
| Sonnet 5 | $0.00008 | $0.00302 |
| Haiku 4.5 | $0.00004 | $0.00151 |
Grade A, and why
base-mcp 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 4d 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.
Copies of this mod
1 near-identical copy found in the catalogue:
- base-mcp — 100% identical, 0 lines differ
How it starts
The opening of the file, as written. The whole thing — 88 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Base MCP
[!IMPORTANT]
Run onboarding at the start of every conversation that touches Base MCP
Including conversations that jump straight to a plugin topic. Onboarding is short — see below.
Detection
The Base MCP exposes its tools to the harness when connected. If no Base MCP tool is callable, the MCP server is not installed: direct the user to https://docs.base.org/ai-agents/quickstart (or load references/install.md for app-specific steps) and stop.
If Base MCP tools are available, load references/tone.md — its rules apply for the entire conversation — then continue to Onboarding. If — and only if — sibling files aren't readable (e.g. you were handed just this SKILL.md body and have no local filesystem access to the skill directory), fetch the same relative path from https://docs.base.org/ai-agents/skills/references/tone.md using the web_request tool from Base MCP. The same fallback applies to every other reference and plugin link in this file (see "Loading referenced files" below).
Onboarding
Keep it short. Do this once per session, before doing real work:
-
Briefly mention what's available — one or two sentences. The user has a Base Account wallet and can do things like check balances, send and swap tokens, sign messages, make x402 payments, batch contract calls, and (if installed) use partner plugins for DeFi, swaps, and other onchain actions. Do not enumerate every tool — the agent discovers tools and plugins directly from the MCP.
-
Show this disclaimer verbatim before proceeding:
By using the Base MCP, you agree to the Base Account and Base App Terms of Service. Plugins available in the Base repo are authored by Base, not by the third-party protocols they reference.
-
Wallet address and balance are optional — only fetch and display them when the user asks, or when a pending operation actually needs the address (e.g., a write call, a position lookup). Don't volunteer a wallet dump up front.
What ships with it
13 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.
- plugins/aerodrome.md 11 KB
- plugins/avantis.md 37 KB
- plugins/bankr.md 11 KB
- plugins/moonwell.md 5.7 KB
- plugins/morpho.md 8.0 KB
- plugins/uniswap.md 14 KB
- plugins/virtuals.md 12 KB
- README.md 4.1 KB
- references/approval-mode.md 2.9 KB
- references/batch-calls.md 1.9 KB
- references/custom-plugins.md 5.3 KB
- references/install.md 4.2 KB
- references/tone.md 1.9 KB
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.
- 4d ago First seen · 88 lines · 42 tokens per session scan A e5ebef132a4e
base-mcp is a skill published in the GitHub repository aeonfun/aeon (714 stars, last pushed today), licensed MIT. It adds 42 tokens to every session and 1,511 once invoked, about $0.0002 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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