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/chrischall/splitwise-mcp/splitwise-mcpnpx skills add chrischall/splitwise-mcp --skill splitwise-mcpgit clone --depth 1 https://github.com/chrischall/splitwise-mcpWhat 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 | $0.00109 | $0.01711 |
| Opus 5 | $0.00055 | $0.00856 |
| Sonnet 5 | $0.00022 | $0.00342 |
| Haiku 4.5 | $0.00011 | $0.00171 |
Grade A, and why
splitwise-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 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 — 162 lines — stays where its author put it; the contents beside it link to each section on GitHub.
splitwise-mcp
MCP server for Splitwise — natural-language expense and group management via the Splitwise API.
Setup
Option A — npx (recommended)
Add to .mcp.json in your project or ~/.claude/mcp.json:
{
"mcpServers": {
"splitwise": {
"command": "npx",
"args": ["-y", "splitwise-mcp"],
"env": {
"SPLITWISE_API_KEY": "your-api-key-here"
}
}
}
}
Option B — from source
git clone https://github.com/chrischall/splitwise-mcp
cd splitwise-mcp
npm install && npm run build
Then add to .mcp.json:
{
"mcpServers": {
"splitwise": {
"command": "node",
"args": ["/path/to/splitwise-mcp/dist/index.js"],
"env": {
"SPLITWISE_API_KEY": "your-api-key-here"
}
}
}
}
Or use a .env file in the project directory with SPLITWISE_API_KEY=<value>.
Getting your API key
- Go to splitwise.com/apps/register
- Register an app (name and description can be anything)
- Copy the API key from the app detail page
Authentication
API key auth — no login flow or token rotation. The key is attached to every request as Authorization: Bearer <key>.
Tools
User
| Tool | Description |
|---|---|
sw_get_current_user |
Get the authenticated user's profile (id, first_name, last_name, email) |
Groups
| Tool | Description |
|---|---|
sw_list_groups |
List all groups with id, name, and members[] |
sw_get_group(id) |
Get a single group's details including members and balances |
sw_create_group(name, group_type?, simplify_by_default?) |
Create a new group (group_type: apartment, house, trip, other) |
sw_add_user_to_group(group_id, user_id?) |
Add a user by user_id (preferred) or first_name + last_name + email |
sw_remove_user_from_group(group_id, user_id) |
Remove a user from a group |
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 · 162 lines · 109 tokens per session scan A d4af2bcf0022
splitwise-mcp is a skill published in the GitHub repository chrischall/splitwise-mcp (1 stars, last pushed 2d ago), licensed MIT. It adds 109 tokens to every session and 1,711 once invoked, about $0.0005 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 2026-08-31.
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