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 | $0.04924 | $0.04924 |
| Opus 5.5 | $0.01970 | $0.01970 |
| Sonnet 5.5 | $0.00985 | $0.00985 |
| Haiku 4.5 | $0.00492 | $0.00492 |
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 20d 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 — 204 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_sweep_area |
tools/search.ts |
Map mode (bounds): GET /stingray/api/gis?user_poly=… per tile — the first tile probes POLY_VARIANTS (user_poly first) and locks the first area-limited shape — quartering any tile that returns the 350-home capZIP mode (zips): per ZIP, location-autocomplete → GET /stingray/api/gis?region_id=…®ion_type=2&…, verified by the homes' own ZIPs |
read (optional local file write — readOnlyHint: false) |
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 (concurrent, retry-once, hard deadline → per-row pending) → 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> (≤50 ids per call; cards with isFavorite:false / isXOut dropped) — 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.
- 20d ago Changed · +1 lines · +32 tokens per session 415eeea8f897
- 27d ago Changed · +1 lines · +110 tokens per session 93158e3a1da7
- 28d ago Changed · +1 lines · +116 tokens per session e30f9bbea360
- 1mo ago Changed · +2 lines · +200 tokens per session 9d54e87418fc
- 1mo ago Changed · +1 tokens per session 9c25e9756c9d
- 2mo ago Changed · +4 lines · +338 tokens per session d10eb656ae80
- 2mo ago Changed · +3 lines · +85 tokens per session 59476fede4b8
- 2mo 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 2d ago), licensed MIT. It adds 4,924 tokens to every session, about $0.0197 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.
redfin-mcp CLAUDE.md compared with instructions from other repositories
| Mod | Type | Stars | Last push | Licence | Scan | Tokens | Works with |
|---|---|---|---|---|---|---|---|
| redfin-mcp CLAUDE.mdchrischall/redfin-mcp | Instructions file | 3 | 2d ago | MIT | A | 4,924 | 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 |