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chrischall

zillow-mcp

by chrischall

Bulk-fetch Zillow properties by zpid

zillow_bulk_get
Read-onlyIdempotent

Fetch up to 200 Zillow property records in one call. Returns a row per input ID, with error handling for each. Concurrent requests are throttled to avoid bot detection, and a hard deadline prevents hanging.

Instructions

Fetch up to 200 Zillow property records in a single call — the "give me everything for these N saved homes" endpoint. Returns one structured row per input id (no pivoted side-by-side summary table — for 2-25 listings with a comparison summary use zillow_compare_properties). Each row is either { zpid, property } on success or { zpid, error, error_kind } on failure — one bad zpid never fails the whole call. Calls fan out concurrently against /homedetails/<zpid>_zpid/ (capped at 6 in flight, per issue #78, with retry-once-on-timeout per sub-request to absorb transient SW evictions). Big lists fan out bounded to 6 in flight and paced by a per-host requests-per-minute throttle (burst 20) so the batch doesn't trip Zillow's PerimeterX bot-wall (issue #90). If the bot-wall is hit, the blocked sub-requests are retried with exponential backoff; anything still blocked is reported with error_kind: "bot_challenge" (distinct from a missing listing) and the response carries a { blocked, retry_after_s } envelope so you can finish the rest in a second pass. The whole call is bounded by an overall hard deadline (issue #98): a single slow/hung row never wedges the server — when the deadline is reached any row that has not yet settled is returned with error_kind: "pending" and the response carries a { pending } count so you can re-run just those ids.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
urlsNoZillow homedetails URLs/paths to fetch. 1..200.
zpidsNoZpids to fetch. 1..200. Provide either zpids or urls.
Behavior5/5

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

Adds substantial context beyond annotations: concurrency cap (6 in flight), per-host rate limiting, retry-on-timeout, bot-wall handling with error_kind 'bot_challenge' and envelope, hard deadline with 'pending' error_kind. No contradictions with annotations (readOnlyHint, openWorldHint, idempotentHint).

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 longer than average but every sentence adds necessary detail. It is front-loaded with purpose and structured logically: purpose, result format, concurrency, throttling, error handling, deadline. Could be slightly tighter, but no redundant sentences.

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?

Given the tool's complexity (concurrent fetches, throttling, multiple error modes, deadline), the description covers all critical aspects. No output schema exists, but the description explains the return structure (rows with success/error, envelope). Sibling tools are listed elsewhere; description handles differentiation.

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%, so baseline is 3. The description adds value by clarifying that either 'zpids' or 'urls' must be provided (mutually exclusive) and specifying the max of 200 (already in schema but restated). Also elaborates on error handling per row, which enriches parameter semantics.

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 clearly states the verb ('Fetch'), resource ('Zillow property records'), and scope ('up to 200', 'single call'). It distinguishes from sibling zillow_compare_properties by explicitly noting the absence of a side-by-side summary table.

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?

Provides explicit when-to-use ('give me everything for these N saved homes'), when-not ('no pivoted side-by-side summary table'), and alternative ('for 2-25 listings with a comparison summary use zillow_compare_properties'). Also mentions error handling and retry behavior, guiding agent on how to handle partial failures.

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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