Borrowing it
Nothing to install: this file belongs to chrischall/redfin-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/redfin-mcp/main/CLAUDE.mdgit clone --depth 1 https://github.com/chrischall/redfin-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/redfin-mcp/claude-md)<a href="https://agentmods.dev/instructions/chrischall/redfin-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chrischall/redfin-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/redfin-mcp/claude-md"><img src="https://agentmods.dev/badge/instructions/chrischall/redfin-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 | $0.04465 | $0.04465 |
| Opus 5 | $0.02233 | $0.02233 |
| Sonnet 5 | $0.00893 | $0.00893 |
| Haiku 4.5 | $0.00447 | $0.00447 |
Grade A, and why
redfin-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 3d 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 — 199 lines — stays where its author put it; the contents beside it link to each section on GitHub.
CLAUDE.md — redfin-mcp
Guidance for Claude working in this repo.
TL;DR
Redfin 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 redfin.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). Redfin validates each request at the session level, so the in-session routing has to be per-call.
Tool surface
| Tool | File | Endpoint(s) | Kind |
|---|---|---|---|
redfin_search_properties |
tools/search.ts |
(a) GET /stingray/do/location-autocomplete?location=… → region OR address(b) GET /stingray/api/gis?region_id=…®ion_type=…&… (region path) — address path short-circuits to a 1-result reply |
read |
redfin_get_by_address |
tools/get-by-address.ts |
GET /stingray/do/location-autocomplete?location=… → first Addresses row → parse /home/<id> |
read |
redfin_get_property |
tools/properties.ts |
(a) GET /stingray/api/home/details/initialInfo?path=… → propertyId+listingId(b) GET /stingray/api/home/details/aboveTheFold?propertyId=…&listingId=… |
read |
redfin_get_property_photos |
tools/photos.ts |
(a) optional initialInfo to resolve IDs(b) GET /stingray/api/home/details/aboveTheFold?… (mediaBrowserInfo.photos[]) |
read |
redfin_get_market_report |
tools/market.ts |
GET /stingray/api/region/<region_type>/<region_id>/<property_type>/market-trends |
read |
redfin_get_price_history |
tools/history.ts |
GET /stingray/api/home/details/belowTheFold?propertyId=…&listingId=… |
read |
redfin_compare_properties |
tools/compare.ts |
GET /stingray/api/home/details/aboveTheFold?… ×N (concurrent) |
read |
redfin_bulk_get |
tools/bulk-get.ts |
per-target ATF/BTF (+optional /home/<id> redirect resolve) ×N (≤200, concurrent, per-row errors, hard deadline) |
read |
redfin_resolve_addresses |
tools/resolve-addresses.ts |
GET /stingray/do/location-autocomplete?location=… ×N (≤100, concurrent) → URL/home_id per row |
read |
redfin_get_climate_risk |
tools/climate.ts |
GET /<homedetails-path> HTML — extract floodData/fireData/heatData blocks |
read |
redfin_get_climate_risk_bulk |
tools/climate.ts |
per-property climate HTML extract ×N (≤100, concurrent) — preserves order, per-row available:false |
read |
redfin_get_area_climate_baseline |
tools/climate.ts |
climate HTML extract over 2–10 sample URLs → averaged baseline + shared cluster_id |
read |
redfin_get_comparable_rentals |
tools/rentals.ts |
GET /stingray/api/home/comparable-rentals?propertyId=…&rentEstimateLow=…&rentEstimateHigh=… |
read |
redfin_get_saved_homes |
tools/saved.ts |
(a) GET /myredfin/favorites HTML → regex propertyIds(b) GET /stingray/do/api/v3/favorites/homecards?b=<csv-ids> — image URLs constructed locally from mlsId+dataSourceId |
read (auth) |
redfin_get_saved_searches |
tools/saved.ts |
GET /myredfin/saved-searches HTML → regex region URLs |
read (auth) |
redfin_calculate_mortgage |
tools/mortgage.ts |
(local; no network) | read |
redfin_calculate_affordability |
tools/affordability.ts |
(local; no network) | read |
redfin_healthcheck |
tools/healthcheck.ts |
GET /robots.txt round-trip through fetchproxy + bridge status incl. the extension link (session_state / pending_pair_code / extension_connected) — the shared registerBridgeHealthcheckTool from @chrischall/mcp-utils/fetchproxy |
read |
redfin_register_session |
tools/sessions.ts |
(local; no network) — params: account_identity (required, min 1), auth_expires_at? |
write (registry) |
redfin_set_active_session |
tools/sessions.ts |
(local; no network) — param: session_id |
write (registry) |
redfin_get_session_context |
tools/sessions.ts |
(local; no network) — no params | 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.
- 3d ago Changed · +4 lines · +338 tokens per session d10eb656ae80
- 4d ago Changed · +3 lines · +85 tokens per session 59476fede4b8
- 8d ago First seen · 192 lines · 4,042 tokens per session scan A 4e014582351a
redfin-mcp CLAUDE.md is an instructions file published in the GitHub repository chrischall/redfin-mcp (3 stars, last pushed 3d ago), licensed MIT. It adds 4,465 tokens to every session, about $0.0223 per session on Opus 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.
Other instructions, from other repositories
next.js AGENTS.md
AGENTS.md instructions for vercel/next.js, covering next.js development guide, codebase structure, monorepo overview, core package: packages/next and other important packages.
codex AGENTS.md
AGENTS.md instructions for openai/codex, covering rust/codex-rs, the codex-core crate, code review rules, crate api surface and model visible context.
vscode buildNext.instructions.md
Working notes and architecture documentation for the new esbuild-based build system in build/next. Use when making changes to the new build pipeline (transpile/bundle commands, NLS plugin, source-map handling, resource copying, or self-hosting watch tasks).
vscode oss-third-party-notices.instructions.md
Instructions for microsoft/vscode, covering vs code oss third-party-notices pipeline, architecture, pipeline flow in ci, applying the notice (cutover) and fallback chain (never fail the build).
langchain AGENTS.md
AGENTS.md instructions for langchain-ai/langchain, covering global development guidelines for the langchain monorepo, corridor security analysis, project architecture and context, monorepo structure and development tools & commands.
spec-kit AGENTS.md
AGENTS.md instructions for github/spec-kit, covering agents.md, about spec kit and specify, quickstart — add a new integration in 5 steps, integration architecture and integrationmanifest — file tracking.