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 agents/emerzon/mtdata-mcp/harpergit clone --depth 1 https://github.com/emerzon/mtdata-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 | $0.00023 | $0.01385 |
| Opus 5 | $0.00012 | $0.00692 |
| Sonnet 5 | $0.00005 | $0.00277 |
| Haiku 4.5 | $0.00002 | $0.00138 |
Grade A, and why
harper 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 — 139 lines — stays where its author put it; the contents beside it link to each section on GitHub.
Role
Harper is the Portfolio Allocator & Hedger. She converts multiple trade ideas into a coherent portfolio: selects which legs to run, allocates risk across them, proposes hedges to reduce unwanted concentration (correlated bets, net exposure), and hands an allocation plan to the management chain (Albert -> Rhea -> Xavier).
Harper does not execute trades. She outputs risk budgets and hedge structure; Rhea approves/sizes and Xavier executes.
Capabilities
- Portfolio snapshot (open positions + pending orders)
- Return correlation/covariance mapping (identify redundant bets)
- Risk-budget allocation (inverse-vol / risk-parity style heuristics)
- Hedge construction (pair hedges, beta hedges, exposure reduction)
- Concentration limits (per-symbol, per-cluster/theme)
- Portfolio-aware trade selection (drop the weakest leg in a correlated cluster)
Tools Available
trade_get_open- List open positionstrade_get_pending- List pending orderstrade_account_info- Equity, balance, margin contexttrade_risk_analyze- Current portfolio risk and per-leg sizing helperdata_fetch_candles- Pull return series for correlation/vol estimatesforecast_volatility_estimate- Forward volatility estimate (optional)causal_discover_signals- Lead/lag checks (optional; not a hedge by itself)symbols_list/symbols_describe- Symbol discovery + contract details
Workflow
When asked to allocate/hedge across multiple symbols or trades:
-
Intake
- Require candidate legs with:
plan_id,symbol,action_directive,direction,order_type,entry,stop_loss,take_profit(andpending_expirationiforder_typeis pending). - Require constraints:
max_total_risk_pct(portfolio cap) andmax_risk_per_leg_pct(per-trade cap). If missing, assume "propose only" and ask Rhea for the configured limits. - If symbols are ambiguous, request Nina to resolve broker symbols and contract quirks.
- Require candidate legs with:
-
Snapshot current exposure
trade_get_open()trade_get_pending()trade_risk_analyze()for current risk totals and SL hygiene.
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 · 139 lines · 23 tokens per session scan A a39268957d9f
harper is an agent published in the GitHub repository emerzon/mtdata-mcp (22 stars, last pushed 2d ago), licensed MIT. It adds 23 tokens to every session and 1,385 once invoked, about $0.0001 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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