Borrowing it
Nothing to install: this file belongs to chrischall/zillow-mcp. Take a copy, put it at the same path in your own repository, and replace the rules that are about this project with yours.
curl -O https://raw.githubusercontent.com/chrischall/zillow-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/chrischall/zillow-mcpWrote this? Show the measurements
A badge with what this costs and how it scanned, read live from this page, so it follows the numbers instead of freezing them. Markdown for a README, HTML for a documentation site or a project page.
[](https://agentmods.dev/instructions/chrischall/zillow-mcp/claude-md)<a href="https://agentmods.dev/instructions/chrischall/zillow-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chrischall/zillow-mcp/claude-md/github.svg" alt="Measured on agentmods" height="20"></a>Or the 80×15 button, for a site that already has a row of RSS and ATOM ones. Only the verdict fits; the numbers stay here.
<a href="https://agentmods.dev/instructions/chrischall/zillow-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chrischall/zillow-mcp/claude-md.svg" alt="Reviewed on agentmods" width="80" height="20"></a>What 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 5.1 | $0.03857 | $0.03857 |
| Opus 5.5 | $0.01543 | $0.01543 |
| Sonnet 5.5 | $0.00771 | $0.00771 |
| Haiku 4.5 | $0.00386 | $0.00386 |
Grade A, and why
zillow-mcp CLAUDE.md scanned grade A with 1 finding 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.
Makes network callslowCapability
Not a fault in itself. Listed so you know the mod talks to something, and to what.
- Don't add IP-rotation or TLS-impersonation libraries. The whole design is "every request rides the user's own browser session via fetchproxy." Adding cycletls / curl-impersonate / Playwright would replace that with a s How it starts
The opening of the file, as written. The whole thing — 197 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md — zillow-mcp
Guidance for Claude working in this repo.
TL;DR
v0.10.x: Zillow MCP server. Default and only transport: localhost WebSocket via @fetchproxy/server — the companion browser extension is installed separately rather than embedded. Every HTTP call to zillow.com is dispatched through the user's signed-in Chrome tab — each request rides their existing session (cookies, TLS, JS context) exactly as if they'd clicked it themselves.
This is a "Pattern A" fetchproxy MCP (every call rides through fetchproxy), not "Pattern B" (one bootstrap call then direct fetch). Zillow validates each request at the session level, so the in-session routing has to be per-call.
Tool surface
| Tool | File | Endpoint | Kind |
|---|---|---|---|
zillow_search_properties |
tools/search.ts |
GET /homes/<location>_rb/?searchQueryState=... SSR |
read |
zillow_sweep_area |
tools/search.ts |
Same SSR search, per map tile (searchQueryState.mapBounds), quartering tiles whose totalResultCount exceeds what paging returns |
read (optional local file write) |
zillow_get_property |
tools/properties.ts |
GET SSR /homedetails/<zpid>_zpid/ (__NEXT_DATA__ gdpClientCache) |
read |
zillow_get_by_address |
tools/get-by-address.ts |
GET /homes/<address-slug>_rb/ SSR — shared 4-rung resolver (resolver.ts) |
read |
zillow_resolve_addresses |
tools/resolve-addresses.ts |
Batch over the shared resolver (resolver.ts), bridge-concurrency-bounded |
read |
zillow_bulk_get |
tools/bulk-get.ts |
fetchPropertyRecord ×N (SSR /homedetails/), concurrency-bounded |
read |
zillow_get_property_photos |
tools/photos.ts |
fetchPropertyRecord (SSR) → property.photos[] |
read |
zillow_get_zestimate_history |
tools/zestimate.ts |
fetchPropertyRecord (SSR) → homeValueChartData |
read |
zillow_get_price_history |
tools/history.ts |
fetchPropertyRecord (SSR) → property.priceHistory |
read |
zillow_get_tax_history |
tools/history.ts |
fetchPropertyRecord (SSR) → property.taxHistory |
read |
zillow_compare_properties |
tools/compare.ts |
fetchPropertyRecord ×N (SSR), concurrent |
read |
zillow_get_saved_searches |
tools/saved.ts |
GET /myzillow/SavedSearches SSR |
read (auth) |
zillow_get_saved_homes |
tools/saved.ts |
GET /myzillow/favorites SSR (collectionsResponse[].homes) |
read (auth) |
zillow_get_market_report |
tools/market.ts |
GET /home-values/<region>/ SSR |
read |
zillow_calculate_mortgage |
tools/mortgage.ts |
(local; no network) | read |
zillow_calculate_affordability |
tools/affordability.ts |
(local; no network) | read |
zillow_estimate_rent_vs_buy |
tools/affordability.ts |
(local; no network) | read |
zillow_healthcheck |
tools/healthcheck.ts |
GET /robots.txt round-trip + bridge status snapshot |
read |
zillow_register_session |
tools/sessions.ts |
(local; no network) | write (registry) |
zillow_set_active_session |
tools/sessions.ts |
(local; no network) | write (registry) |
zillow_get_session_context |
tools/sessions.ts |
(local; no network) | read |
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 Changed · +6 lines · +93 tokens per session 09550b7923b3
- 20d ago Changed · +1 lines · +49 tokens per session c5f5331ee1da
- 28d ago Changed · +3 lines · +168 tokens per session 4dba16531e5b
- 1mo ago Changed · +2 lines · +125 tokens per session 7d0f3cfcc408
- 1mo ago Changed · +21 tokens per session 360c7e582921
- 2mo ago Changed · -1 lines · +22 tokens per session 8340fc70eec9
- 2mo ago First seen · 186 lines · 3,379 tokens per session scan A 15f30619fe1d
zillow-mcp CLAUDE.md is an instructions file published in the GitHub repository chrischall/zillow-mcp (0 stars, last pushed 2d ago), licensed MIT. It adds 3,857 tokens to every session, about $0.0154 per session on Opus 5.5. A static security scan graded it A with 1 finding (makes network calls). No closer match exists in the catalogue, so it is treated as the original; first seen 2026-08-31.
zillow-mcp CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| zillow-mcp CLAUDE.mdchrischall/zillow-mcp | Instructions file | 0 | 2d ago | MIT | A | 3,857 | Claude Code |
| vscode buildNext.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 9,719 | GitHub Copilot |
| next.js AGENTS.mdvercel/next.js | Instructions file | 143k | yesterday | MIT | A | 7,461 | Codex, OpenCode |
| langchain AGENTS.mdlangchain-ai/langchain | Instructions file | 149k | yesterday | MIT | A | 4,680 | Codex, OpenCode |
| vscode oss-third-party-notices.instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 5,516 | GitHub Copilot |
| vscode copilot-instructions.mdmicrosoft/vscode | Instructions file | 195k | yesterday | MIT | A | 3,093 | GitHub Copilot |
| deepseek-harness AGENTS.mddeepseek-ai/deepseek-harness | Instructions file | 274k | 2d ago | MIT | A | 4,313 | Codex, OpenCode |