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Polymarket Arbitrage

polymarket_arbitrage
Read-onlyIdempotent

Find arbitrage opportunities on Polymarket via monotonicity violations + partition-sum checks. Call with NO args for a trending_scan of the top ~200 markets by weekly volume; pass event for the strongest per-event partition_check, or topic for a themed cross-event scan. event (recommended for a specific market): pass a Polymarket event slug like "fed-decision-may-2026" or "when-will-bitcoin-hit-150k"; walks child markets, checks date-axis / threshold-axis ordering AND computes the partition_check (sum of YES prices across mutually-exclusive legs — should ≈1; deviations >3pp emit a BUY/SELL EVERY LEG signal). topic (for cross-event scanning): pass a seed question like "Strait of Hormuz traffic returns to normal" or "Fed rate decision"; searches related events across the platform, flattens markets, runs the comparator on the union. Cross-event mode catches "...by May 31" vs "...by Jun 30" patterns that single-event misses. SEMANTIC ANCHOR: cross-event pairs require ≥0.30 Jaccard similarity on question tokens (prevents Powell-Fed-Pause being paired with Powell-DOJ-probe); skipped_low_similarity surfaces the rejected pair count. PARTITION FILTER: drops will-person-X / will-manager-Y / will-someone-else- placeholder slugs; partitions with >20% placeholder fraction return null arb signal. Response: opportunities[] (gap_pp, suggested_trade, reasoning, monotonicity violation context), and in event mode partition_check{sum_yes_prices, gap_from_1, placeholders_filtered, suggested_trade}. FILL CHECK: when the partition signal fires, arbitrage.fill_check prices it against live CLOB depth (theoretical_edge_pp_at_book vs realizable_edge_pp at 1000 shares/leg, thin_legs[]) — realizable_edge_pp ≤ 0 means the overround exists only at last-trade, not in the book; do not trade it. For custom sizing use polymarket_fill_risk.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
eventNoSingle-event mode (use this if you know the specific Polymarket event): event slug like "fed-decision-may-2026" or "when-will-bitcoin-hit-150k". Full Polymarket URLs also accepted.
topicNoCross-event mode (use this if you want to scan related events across the platform): a topic or seed question like "Fed rate decision" or "Strait of Hormuz traffic returns to normal". Tool searches Polymarket for related events and checks monotonicity across them.

TDQS

A4.8/5.0
Behavior5/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations already declare read-only, non-destructive, and idempotent behavior, so the description's burden is reduced. It adds substantial behavioral depth: the trending_scan volume threshold, partition-check thresholds (>3pp), placeholder filtering, Jaccard similarity requirement, and the fill-check pricing against live CLOB depth with the 'do not trade it' caution. No contradiction with annotations.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness4/5

Is the description appropriately sized, front-loaded, and free of redundancy?

The description is long but information-dense, with logical headers and a front-loaded core sentence. Every section adds necessary details for correct invocation (modes, filters, fill check, output). It earns its length for a complex tool, though a slightly tighter structure would improve scannability.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

This is a high-complexity tool with two modes, multiple filters, and an external fill-check dependency, yet no output schema. The description compensates thoroughly by specifying default behavior, mode-specific parameters, output fields, filter semantics, similarity thresholds, and fill-risk caveats, plus a pointer to polymarket_fill_risk. It is effectively complete for an agent to decide and invoke.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100% with good parameter descriptions, so the baseline is 3. The tool description adds value beyond the schema by documenting the no-argument mode, giving concrete slug/seed examples, explaining 'Full Polymarket URLs also accepted', and clarifying the semantic difference between `event` and `topic`. This pushes it above baseline but not to 5 since the schema already covers basic parameter intent.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

The description opens with a specific verb and resource: 'Find arbitrage opportunities on Polymarket via monotonicity violations + partition-sum checks.' It clearly distinguishes itself from sibling tools by naming the detection mechanisms and explicitly referencing polymarket_fill_risk for custom sizing, separating itself from related Polymarket tools.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Usage guidance is explicit and thorough: it explains the no-args trending scan, when to use `event` vs `topic`, gives examples for each, and describes behavior such as 'event (recommended for a specific market)'. It even states when not to trade through the fill check caveat, providing clear decision support.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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TDQS

A4.1/5.0
Disambiguation4/5

Most tools have clearly distinct purposes, but there is some overlap among similarly named tools like ask_pipeworx, deep_research, and bet_research, which could cause misselection. However, detailed descriptions help differentiate them.

Naming Consistency3/5

Tool names follow a mix of patterns (verb_noun, noun_noun, etc.) and use different prefixes (polymarket_, sec_8k_, pipeworx_), which is somewhat inconsistent but still readable and descriptive overall.

Tool Count3/5

34 tools is on the higher side, with several tools dedicated to specific subdomains (e.g., 6 Polymarket-related, 4 SEC 8-K tools). While each has a distinct role, the number feels slightly bloated for a single server.

Completeness4/5

The tool surface covers a broad range of data research and monitoring tasks, including filings, entity profiles, claims, and prediction markets. Minor gaps exist (e.g., no data writing tools), but core workflows are well-supported.