# LangChain — API Agent Score

> Score: 81/100 (Grade: A) | Domain: langchain.com | Rubric: 1.0.0 | Checked: July 24, 2026

LangChain scored 81/100 (A), classified "ai-ready".

[View full report](https://www.postman.com/ai/ai-ready-apis/company/langchain)
[All organizations](https://www.postman.com/ai/ai-ready-apis/llms.txt)

## Summary

- Overall: 81/100 (A)
- Classification: ai-ready

## Category Scores

- API Design: 87/100 (A)
- Developer Experience: 49/100 (F)
- Agent Discovery: 90/100 (A+)
- Agent Understanding: 82/100 (A)
- Agent Usability: 92/100 (A+)

## Check Results

### API Design

- [pass] Auth declared & discoverable — authentication documented in the docs site at https://docs.langchain.com/api-reference/auth-service-v2/check-oauth-token-exists. Investigated: spec 100%, docs 100%.
- [warn] Machine-readable, versioned contract — info.version="0.1.0" set but no versioning scheme (URL / header / media type) detected. Investigated: spec 75%, docs 50%.
- [warn] Schema coverage & depth — 968 of 4019 public signatures use loose types (anyTypeRatio=0.241). Investigated: sdk 67%, spec 67%.
- [pass] Security & governance hygiene — No credential-shaped strings detected in spec. Investigated: spec 100%, wellknown 0%.
- [pass] Example coverage — README is present and includes a runnable quickstart. Investigated: sdk 100%, spec 0%, docs 0%.

### Developer Experience

- [pass] Description completeness — 61% description completeness (target 90%+). Investigated: spec 100%, sdk 81%.
- [pass] Changelog published — changelog documented in the docs site at https://docs.langchain.com/langsmith/agent-server-changelog. Investigated: spec 100%, docs 100%, sdk 100%.
- [fail] Self-service developer portal — No signup page detected across conventional paths (/signup, /sign-up, /register, /get-started, /console/signup, /dashboard/signup, /try, /try-free, /free, /free-trial, /start, /start-free). Investigated: docs 0%.
- [fail] Quickstart present — No quickstart/getting-started page found at the conventional paths. Investigated: docs 0%.
- [fail] Code samples in docs — No detectable code samples across 20 sampled docs pages. Investigated: docs 0%.

### Agent Discovery

- [pass] Registry & SDK presence — Indexed on Context7 (websites/langchain_oss, 20458 snippets). Investigated: docs 100%, cli 100%, sdk 50%, mcp 0%, wellknown 0%.
- [warn] Docs reachable, not hard auth-gated — 1 of 50 sampled pages use cross-host redirects. Investigated: docs 88%.
- [warn] llms.txt present, valid & comprehensive — llms.txt covers 945/1469 sitemap doc pages (64%); 524 missing; 11 llms.txt links not in sitemap (may indicate stale links or incomplete sitemap). Investigated: docs 75%, sdk 0%.
- [pass] Crawlable / AEO — Docs paths crawlable by all monitored AI agents. Investigated: wellknown 100%.

### Agent Understanding

- [pass] Machine-readable errors (RFC 9457) — 5 distinct 4xx/5xx response codes documented. Investigated: docs 100%, spec 50%, sdk 0%.
- [pass] Operation purpose clarity — 100% of operations have a clear summary + operationId an agent can select on. Investigated: spec 100%.
- [warn] Agent-navigable, token-efficient docs — 4 of 50 pages have minor content differences between markdown and HTML. Investigated: docs 78%.
- [pass] Docs structured data — JSON-LD Article markup on 19/19 assessed pages (100%) with dateModified present. Investigated: docs 100%.
- [warn] Description consistency across surfaces — Mean pairwise description similarity across 2 surfaces (spec, docs) is 4% (threshold 35% for full credit).
- [fail] Agent instructions file (AGENTS.md) — No AGENTS.md at the site root or /.well-known/. Investigated: wellknown 0%.

### Agent Usability

- [pass] Idempotency documented — Built-in retry machinery is present (grep-derived). Investigated: sdk 100%, spec 0%, docs 0%.
- [pass] Rate-limit signaling — rate-limit behavior documented in the docs site at https://docs.langchain.com/langsmith/llm-gateway-rate-limit-policies. Investigated: spec 100%, docs 100%.
- [pass] Pagination documented & consistent — Pagination params detected on 9 list endpoint(s). Investigated: docs 100%, spec 75%.
- [pass] Sandbox separation — sandbox documented in the docs site at https://docs.langchain.com/langsmith/sandbox-cli. Investigated: spec 100%, docs 100%, sdk 100%.
- [fail] Runnable collection with test scripts — No public Postman workspace discovered for the org. Investigated: platform 0%.

## Executive Summary

LangChain's API program performs well across contract quality, discoverability, and documentation structure — but partner onboarding is the critical gap holding the program back. There is no self-service portal, no quickstart, and no code samples, meaning partners and their agents cannot get hands-on without a sales conversation. Closing the onboarding gap and adding machine-readable agent context (an AGENTS.md file and a runnable, test-backed collection) should be the immediate priority to unlock self-serve partner adoption at scale.