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compass-mcp

by chrischall

Bulk-fetch Compass listings by url or listing_id_sha

compass_bulk_get
Read-onlyIdempotent

Retrieve up to 200 Compass property listings in a single call. Each target returns its own result, with retryable status on timeouts or bridge failures.

Instructions

Fetch up to 200 Compass listings in a single call. Returns one structured row per input target (no side-by-side summary table — use compass_compare_properties for that). Each row is either { listing_id_sha, url, property } on success or { listing_id_sha, url, error } on failure — one bad target never fails the whole call. When the failure was a bridge timeout (after one retry) or an unreachable bridge (issue #73), the row also carries { status: "timeout" | "bridge_down", retryable: true } — that is NOT a missing listing, so retry it (a cold bridge usually succeeds on the second call) rather than concluding Compass has no record. Targets accept the same url / listing_id_sha shape as compass_get_property. Calls fan out concurrently. The whole call is bounded by an overall deadline: a slow or hung row never wedges it — any row still unsettled when the deadline is reached comes back as { status: "pending", retryable: true, error } alongside a top-level pending count, so re-run just those targets. extracted_features is populated per row. The raw description is omitted by default — pass include_description: true to keep it.

Input Schema

TableJSON Schema
NameRequiredDescriptionDefault
targetsYesUp to 200 targets to fetch. For higher counts, batch into multiple calls.
include_descriptionNoInclude the raw `description` on each row. Defaults to `false` — `extracted_features` is always populated.

Schema Changelog

Changes observed during successful MCP inspections.

  1. Changed1 schema field changedv1.0.0
    • changedInput schema / $schema
      Previous value: -"http://json-schema.org/draft-07/schema#"New value: +"https://json-schema.org/draft/2020-12/schema"
  2. First observedv0.12.1

TDQS

A4.8/5.0
Behavior5/5

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

Annotations already declare readOnlyHint, openWorldHint, and idempotentHint, and the description adds substantial behavior beyond that: per-row error isolation ('one bad target never fails the whole call'), timeout/bridge_down semantics with retryable flags, concurrent fan-out, an overall deadline that converts unsettled rows to pending, and the always-populated extracted_features. No contradictions with the 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?

Purpose is front-loaded and every sentence earns its place — nothing is filler. However, the bridge-timeout sentence is overloaded with status literals, retry advice, and an internal 'issue #73' reference, and 'retryable: true' appears twice. Dense and purposeful but slightly over-packed.

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?

With no output schema, the description must document return values and does so thoroughly: exact row shapes for success, error, timeout/bridge_down, and pending states, a top-level pending count, concurrency, deadline behavior, and per-row field defaults. Combined with fully documented parameters and sibling differentiation, nothing an agent needs to invoke and interpret this complex bulk tool is missing.

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% and the schema descriptions are already rich (maxItems 200, batching advice, include_description default). The description adds value above that baseline by stating targets accept the 'same url / listing_id_sha shape as compass_get_property,' which lets an agent transfer parameter knowledge across tools, and by reinforcing the include_description default. Genuine added value, though the schema does most of the heavy lifting.

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?

Opens with a specific verb+resource+scope: 'Fetch up to 200 Compass listings in a single call.' It further differentiates from siblings by saying 'no side-by-side summary table — use compass_compare_properties for that' and cross-references compass_get_property as the shape-compatible single-fetch variant. An agent can tell exactly what this tool is for without reading the schema.

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?

Gives explicit when-not guidance by routing the comparison-summary use case to compass_compare_properties. It also gives actionable retry policy: rows with status 'timeout'/'bridge_down' should be retried 'rather than concluding Compass has no record,' and pending rows should be 're-run just those targets' — clear when-to-call and when-to-retry guidance.

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