# Mastra vs Strands Agents (slim)

> Strands Agents scores 80 (A) to Mastra's 74.2 (BB) for agent frameworks. Prices, MCP, x402, uptime and agent notes side by side.

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Strands Agents scores 80 (A) on agent readiness against Mastra's 74.2 (BB), and leads in 1 of 7 scored categories. Mastra leads on agent ergonomics and maintenance & community. Both do agent frameworks.

- Mastra: BB 74.2, rank #91 of 1510 · https://www.anchorterminal.com/tools/mastra.min.md
- Strands Agents: A 80, rank #15 of 1510 · https://www.anchorterminal.com/tools/strands-agents.min.md
- Mastra, good for TypeScript teams that want agents, workflows, memory, evals and a local Studio in one framework. Ahead on Agent ergonomics, 92 against 87; Maintenance & community, 96 against 87.
- Strands Agents, good for Python or TypeScript teams, especially on AWS, who want a model-driven loop with MCP, multi-agent patterns and approval gates. Ahead on Security & auth, 89 against 67. Also No key needed to call it.

| Category | Mastra | Strands Agents |
| --- | --- | --- |
| Reliability (16%) | 87 | 87 |
| Performance (10%) | pending | pending |
| Schema & documentation (13%) | 98 | 95 |
| Agent ergonomics (13%) | 92 | 87 |
| Security & auth (14%) | 67 | 89 |
| Payments & pricing (10%) | 60 | 60 |
| Task success (10%) | pending | pending |
| Maintenance & community (7%) | 96 | 87 |
| Transparency & trust (7%) | 72 | 72 |

| Fact (where they differ) | Mastra | Strands Agents |
| --- | --- | --- |
| Vendor | Kepler Software, Inc. | Amazon Web Services |
| Auth | API key | None |
| Licence | Apache-2.0 for the core. Code under ee/ directories is source-available under the Mastra Enterprise License, free for development and testing | Apache-2.0 |
| Terms last updated | 2026-10-26 | no document linked |
| Privacy policy last updated | no date given | no document linked |
| Customer content may train models | yes | not read yet |
| Terms restrict automated access | yes | not read yet |
| Terms restrict benchmarking | not found in the text | not read yet |
| Terms or service can change without notice | yes | not read yet |
| Arbitration or class-action waiver | yes | not read yet |
| Popularity | 29k stars, 3.1M npm/wk | 9.1k stars, 698k npm/wk, 8.9M PyPI/wk |

Why the edge:
- Security & auth, Strands Agents +22: Mastra 67 (The CLI sends PostHog analytics, server startup sends token counts per model and a count of registered agents, tools and MCP servers, and Studio sends browser analytics, all on by default and documented, with one opt-out, MASTRA_TELEMETRY_DISABLED=1. Since #26986 (16 October 2026) each server process also reports token use per provider and model every 15 minutes, and the telemetry reference read on 6 November says server events carry a project identifier that is a raw Platform UUID or a hash of the Git origin remote, so they "aren't anonymous" (12). requireToolApproval on agents and MCP servers, allowedHosts for MCP HTTP, a curated environment for stdio servers, and sandboxed workspaces (20). PromptInjectionDetector, PII and moderation processors, and docs that call tool results untrusted model input (15). Built-in tracing with OpenTelemetry and other exporters (15). No SECURITY.md, no security.txt and no bug bounty found. A blog post says Mastra is SOC 2 Type II audited, which isn't scored for a framework, and we found no public advisory from Mastra about the June incident (5). Framework reading. 15+20+15+15+5 = 70 on 6 October, 12+20+15+15+5 = 67 on 6 November.); Strands Agents 89 (Framework reading (telemetry defaults, approvals, guardrails, sandboxing). No usage analytics found in either SDK, and OpenTelemetry is opt-in (25). Interrupts and the harness's interventions gate tool calls behind human approval or Cedar policies, but the default sandbox is the local host (16). Guardrails, PII redaction and trusted message history pages, with Bedrock Guardrails integration (13). OpenTelemetry traces for every model and tool call (15). The AWS Vulnerability Disclosure Program on HackerOne and three advisories in October 2026 published with fixed versions (20). 25+16+13+15+20 = 89.)
- Maintenance & community, Mastra +9: Mastra 96 (@mastra/core 1.82.0 on 2026-11-04 (30). 27 stable releases in the 90 days to 6 November, 8 of them since 6 October (20). 436 open issues on 6 November, all 50 newest issues commented and 24 of them closed (22). Client, MCP and store packages are current, and @mastra/mcp 1.x stays supported beside 2.x (15). Renovate and CI configured, with the newest runs on main passing (9). 30+20+22+15+9 = 96.); Strands Agents 87 (Python 1.64.0 and TypeScript 1.24.0 tagged on 4 November 2026 (30). Python 1.55.0 on 8 September, 1.61.0 on 14 October, 1.62.0 on 21 October and 1.63.0 on 30 October among many releases in 90 days (20). 664 open issues and 1,151 open issues and pull requests on 6 November, with 545 issues opened in the 90 days to 3 November. Of the 50 newest, 12 had a comment and 15 were closed, and 9 of the 40 newest open items carry a bug label. An issue-responder workflow runs on new issues (12). Both official SDKs are current (15). Dependency floors, security-audit workflows and CI passing on main (10). 30+20+12+15+10 = 87.)
- Agent ergonomics, Mastra +5: Mastra 92 (An MCP client in about ten lines with listTools() for static or listToolsets() for per-request tools, and ToolSearchProcessor for loading tools on demand (25). Step limits, memory windows and processors such as a token limiter control what reaches the model (20). MastraError with ids and categories, and processors can abort with a reason the caller can read (17). Workflow step retries, snapshots and durable agents for resuming (20). create-mastra scaffolds a project and the model router takes a plain string, but it's TypeScript only (10).); Strands Agents 87 (Framework reading. An MCPClient is passed straight to the agent in a few lines and its lifecycle is managed, with tool filtering per client (22). Conversation managers, turn limits, token budgets and cancellation bound each run (20). Stop reasons and typed events, and hooks that can retry a model or tool call (16). Retry strategies, session managers that persist and resume a conversation, and interrupts that resume where they paused (17). Two official languages, but the default provider is Bedrock, which needs AWS credentials and model access (12). 22+20+16+17+12 = 87.)