# BoxLang AI vs Cursor Agent SDK (slim)

> BoxLang AI scores 65.8 (B) to Cursor Agent SDK's 63.7 (B) for agent frameworks. Prices, MCP, x402, uptime and agent notes side by side.

- Full: https://www.anchorterminal.com/compare/boxlang-ai-vs-cursor-agent-sdk.md (~4,600 tokens) · this version ~2,730 tokens · JSON https://www.anchorterminal.com/compare/boxlang-ai-vs-cursor-agent-sdk.json · canonical https://www.anchorterminal.com/compare/boxlang-ai-vs-cursor-agent-sdk
- Index: https://www.anchorterminal.com/llms.txt · API: https://www.anchorterminal.com/api/v1/index.json · MCP: https://www.anchorterminal.com/mcp · Updated: 2026-11-01
- Licence: CC BY 4.0, credit Anchor Terminal and link this page (https://www.anchorterminal.com/terms/#data)

BoxLang AI scores 65.8 (B) on agent readiness against Cursor Agent SDK's 63.7 (B), and leads in 4 of 7 scored categories. Cursor Agent SDK leads on schema & documentation and agent ergonomics. Both do agent frameworks.

- BoxLang AI: B 65.8, rank #328 of 1260 · https://www.anchorterminal.com/tools/boxlang-ai.min.md
- Cursor Agent SDK: B 63.7, rank #437 of 1260 · https://www.anchorterminal.com/tools/cursor-agent-sdk.min.md
- BoxLang AI, good for Teams already running BoxLang or modernising CFML on the JVM who want agents, RAG and MCP with approval and guardrails in the same language Ahead on Reliability, 66 against 45; Payments & pricing, 50 against 30; Maintenance & community, 83 against 74. Also No key needed to call it; Open source.
- Cursor Agent SDK, good for Teams already on Cursor who want version-controlled agents for pull request review, triage and Slack, with evals in CI and one-command hosting. Ahead on Schema & documentation, 82 against 71; Agent ergonomics, 80 against 74. Also No incidents deducted, where BoxLang AI loses 3 points for them.

| Category | BoxLang AI | Cursor Agent SDK |
| --- | --- | --- |
| Reliability (16%) | 66 | 45 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 71 | 82 |
| Agent ergonomics (13%) | 74 | 80 |
| Security & auth (14%) | 71 | 68 |
| Payments & pricing (10%) | 50 | 30 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 83 | 74 |
| Transparency & trust (7%) | 70 | 71 |

| Fact (where they differ) | BoxLang AI | Cursor Agent SDK |
| --- | --- | --- |
| Vendor | Ortus Solutions | Cursor |
| Auth | None | OAuth or key |
| Pricing | Free | Your plan |
| Licence | Apache-2.0 | Proprietary. The package's LICENSE.md reads "© Anysphere Inc. All rights reserved", with use subject to Cursor's Terms of Service (updated 3 September 2026). No source repository is published |
| Last release | 2026-10-20 | 2026-10-25 |
| Terms last updated | no date given | 2026-09-03 |
| Privacy policy last updated | no date given | 2026-09-29 |
| Terms restrict automated access | not found in the text | yes |
| Terms restrict benchmarking | not found in the text | yes |
| Terms or service can change without notice | not found in the text | yes |
| Arbitration or class-action waiver | not found in the text | yes |

Why the edge:
- Reliability, BoxLang AI +21: BoxLang AI 66 (Read with the local-software lines. Official package on ForgeBox, installed with `install-bx-module bx-ai` or `box install bx-ai`, with BoxLang 1.14.0 or later in box.json and JDK 21 in CONTRIBUTING.md, but the 3.6 announcement says BoxLang 1.18 or later (18 of 20). tests.yml runs about 140 test classes against Ollama and the vector stores in Docker Compose, and against paid providers on development and releases, on pull requests and pushes to development. Whether runs pass wasn't read, since WebFetch refused github.com (15 of 25). Open issues and replies weren't read for the same reason. The changelog closes issues #182 to #259 in 3.3.1 to 3.4.0, and bugs also go to Ortus's Jira (10 of 25). Keep a Changelog with semantic versioning stated and Migration sections, but breaking changes ship in minor releases (8 of 15). 3.6.0, past 1.0 (15). 66 in all.); Cursor Agent SDK 45 (Local-package reading, since the owner runs the framework, with Cursor's hosting as an option. Official npm package with Node 22.13 or newer stated in engines and in the docs, which also say never Bun (20). Closed source, so no public CI or test suite (0). No public issue tracker. github.com/cursor/cursor holds a README and SECURITY.md, and forum.cursor.com has no Agent SDK tag, so there's nothing to count open crashes against. The troubleshooting page lists known failures with fixes (5). A dated changelog of two entries, 0.2.29 and 0.3.0, both 23 October 2026, and 0.3.0 calls out the removed `persistent` option, but the 27 earlier @cursor/bdk versions and 123 @cursor/july versions have no notes, and one build ships under three package names (5). Version 0.3.0, but the changelog post of 20 October says generally available and the docs changelog labels 0.3.0 the GA release, which we read as declared stable (15). 20+0+5+5+15 = 45.)
- Payments & pricing, BoxLang AI +20: BoxLang AI 50 (Self-hosted rule, scored on the paid option. No payment protocol (0). BoxLang runtime plans are public without a login, Starter $749 a year and BoxLang+ and BoxLang++ from $1,999 to $4,999 a server or node a year, plan pricing rather than per unit (10). The Apache-2.0 module installs with no card (20) and no account or sign-up (20). 50 in all.); Cursor Agent SDK 30 (Framework reading of the published rubric. No payment protocol (0). Per-million-token prices for Cursor models, including the default Grok 4.5 with Fast, and plan prices are public, but no price for managed hosting and no statement of which plans cover the Agent SDK were found (15). The package is free and the Free plan needs no card, but its usage is only described as limited agent requests (15). A person signs in through a browser or creates an API key in the dashboard before a model turn runs (0). 0+15+15+0 = 30.)
- Schema & documentation, Cursor Agent SDK +11: BoxLang AI 71 (Framework reading. A reference page for each built-in function with its arguments, and tool schemas generated from typed function arguments with required fields since 3.3.1. BoxLang is dynamically typed and no published API reference was found, though the repository builds DocBox API docs (15 of 25). llms.txt with about 150 entries and a Markdown copy of every page (10). The FAQ says when to use aiChat() or aiAgent() and the security guide says which guards to use when, though some FAQ links still say coming soon for pages that exist (14 of 20). Tool arguments are typed with required lists, and stdio options a server doesn't have throw InvalidArgument (11 of 15). About 100 example scripts in the repository and a gallery on ai.boxlang.io, but the production guide catches RateLimitException, TimeoutException and AuthenticationException, which the module's source never throws, and there is no exception reference (9 of 15). Keep a Changelog and a release-history page per version, but the 3.6.0 page still read unreleased on 1 November and two old versions appear twice in the changelog (12 of 15). 71 in all.); Cursor Agent SDK 82 (Framework reading. Typed TypeScript declarations ship in the package, tools take Zod or JSON Schema, `agent-sdk help --json` describes every command's flags and exit codes, and `GET /v1/info` and `GET /v1/tools/:name` return the discovered surface and each tool's schemas. No OpenAPI document for the HTTP routes (20). cursor.com/llms.txt lists every Agent SDK page with a Markdown twin, and the package ships the docs and an llms.txt (10). The overview has a table of when to use the Agent SDK, Automations or Grok Bot, and the hooks page has a table of what to use instead of a hook for each job (18). Typed config, `effect` as an enum or predicate, `timeArgs` checked against the input schema, and slug patterns stated (13). Examples on every page, with error tables for direct tool calls, HTTP 401, 403 and 409, the limit error's JSON and seven exit codes (15). A dated changelog, but only two entries, both from 23 October 2026 (6). 20+10+18+13+15+6 = 82.)
- Maintenance & community, BoxLang AI +9: BoxLang AI 83 (3.6.0 on 2026-10-20 (30). Three releases in the 90 days to 1 November, 3.4.0 on 1 September, 3.5.0 on 11 September and 3.6.0 on 20 October (20). 79 commits on the development branch in those 90 days from Luis Majano, Doug Cain, Copilot and dependency bots, with pull requests up to #326 merged on 1 November. Issue reply times couldn't be read (10 of 25). The ForgeBox package is current at 3.6.0 (15). Dependabot for Gradle monthly and Actions quarterly, tests on pull requests and development, and a format check (8 of 10). 83 in all.); Cursor Agent SDK 74 (0.3.0 on npm on 25 October 2026 (30). Five @grok/agent-sdk versions from 22 to 25 October and 29 @cursor/bdk versions since 22 September (20). Closed product. A public changelog with two entries and a forum with no Agent SDK tag, so we couldn't see replies to SDK reports (8). The npm package is current and official, TypeScript only (12). Dependencies are current releases, but there's no public CI and the same build goes out under three names with a postinstall script (4). 30+20+8+12+4 = 74.)
- Agent ergonomics, Cursor Agent SDK +6: BoxLang AI 74 (Framework reading, scored on what a tool-calling agent with MCP takes. An agent with an MCP server is one `aiAgent()` call with `mcpServers`, and `toolFilter` and `prefix` limit what each server adds. Skills can load lazily, but `autoLoadSkills` is on by default and injects every SKILL.md under /.agents/skills into every agent (20 of 25). MaxToolCallsMiddleware caps tool calls, window and summary memory bound history by messages or tokens, `withMaxResponseBytes` caps MCP answers and `listTools( cursor )` pages tools (17 of 20). Named exceptions (ProviderError, UnsupportedCapability, InvalidArgument, MCPCommandRefused, BXAI.SecurityViolation) but no reference page, and the changelog says a timed-out call still surfaces as a JSON parse error (12 of 20). RetryMiddleware with exponential backoff, approval resumes that don't replay the model call or rerun executed tools, and a stdio client that never repeats an in-flight call. MCP tool annotations such as readOnlyHint aren't read (15 of 20). An agent needs a name and works with defaults, and a mock provider runs with no key, but it is one language (10 of 15). 74 in all.); Cursor Agent SDK 80 (Framework reading, scored on what it takes to run a tool-calling agent with MCP. One file per tool and one file per MCP connection, `tools` and `disallowedTools` filters with `effects: "read"`, and an allowlist for the harness's built-in tools (22). Concurrency caps with queued turns, `--fields`, page tokens and limits on list commands, and a per-session cost view. We found no turn cap or spend cap for a run (12). Built-in routes return `{ ok: false, error }` codes, direct tool calls have documented 400, 404, 409 and 500 codes, and the CLI has seven exit codes (18). Reads and idempotent calls retry up to three times, writes run once, MCP readOnlyHint and idempotentHint decide retries for connection tools, and dry-run sessions stub writes (20). `agent-sdk init` scaffolds a working project and every agent field is optional, but the framework is TypeScript only (8). 22+12+18+20+8 = 80.)