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    "title": "Companies House Filing Monitor - UK Company Changes",
    "description": "Monitor filings for explicit UK company watchlists. Export filing dates, types, descriptions and document links, with saved new or changed observations. No API key.",
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            "type": "array",
            "description": "Explicit watchlist of at most 20 Companies House numbers, including leading zeros or a two-letter prefix. Empty input uses Tesco 00445790. No bulk company discovery.",
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