--- title: "Tool result records: Mastra" description: "Every probe record for Mastra. 29 records, version mcp-2.9.0-alpha.1+core-1.83.0-alpha.1, no registry entry yet. Overlay data/verified/mastra.json." canonical: https://canimcp.io/tool-results/mastra last-updated: 2026-11-11 --- # Tool result records: Mastra The verdict line for each probe run, with a link to the record and its captures. The cross-client matrix is on [Tool result handling, verified](/tool-results.md). 29 records, version `mcp-2.9.0-alpha.1+core-1.83.0-alpha.1`, no registry entry yet. Overlay `data/verified/mastra.json`. | Scenario | Config | Run | At | Version | Verdict | |---|---|---|---|---|---| | [app_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.app_only/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | tool not offered to the model | | [meta_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.meta_only/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | ⟨…⟩ envelope (content 1x, structuredContent 0x, _meta reached the model) | | [meta_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/legacy/both-stdio/tools.result.meta_only/record.json) | legacy | stdio | `2025-11-25` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | ⟨…⟩ envelope (content 1x, structuredContent 0x, _meta reached the model) | | [meta_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/return-errors/both-stdio/tools.result.meta_only/record.json) | return-errors | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | ⟨…⟩ envelope (content 1x, structuredContent 0x, _meta reached the model) | | [with_meta](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.with_meta/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json, _meta did not reach the model) | | [with_meta](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/legacy/both-stdio/tools.result.with_meta/record.json) | legacy | stdio | `2025-11-25` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json, _meta did not reach the model) | | [with_meta](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/return-errors/both-stdio/tools.result.with_meta/record.json) | return-errors | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json, _meta did not reach the model) | | [audience_user](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.audience_user/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [empty_object](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.empty_object/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | "…" client error text, no fixture field: "Invalid result for tools/call: [\n {\n \"expected\": \"array\",\n \"code\": \"inval" | | [large](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.large/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [no_content_key](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.no_content_key/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | "…" client error text, no fixture field: "Invalid result for tools/call: [\n {\n \"expected\": \"array\",\n \"code\": \"inval" | | [is_error](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.is_error/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | […] content only (1x, as text) | | [is_error](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/return-errors/both-stdio/tools.result.is_error/record.json) | return-errors | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | ⟨…⟩ envelope (content 1x, structuredContent 1x) | | [with_image](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.with_image/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [schema_match](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.schema_match/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | […] content only (1x, as text) | | [schema_mismatch](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.schema_mismatch/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | "…" client error text, no fixture field: "Structured content does not match the tool's output schema: data must have requi" | | [mirror](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-http/tools.result.mirror/record.json) | default | http | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | payload once (as json) | | [mirror](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.mirror/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | payload once (as json) | | [mirror](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/legacy/both-stdio/tools.result.mirror/record.json) | legacy | stdio | `2025-11-25` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | payload once (as json) | | [sc_empty](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.sc_empty/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | "…" no marker reached the model; payload: "{}" | | [sc_null](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.sc_null/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | "…" no marker reached the model; payload: "null" | | [sc_string](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.sc_string/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as text) | | [structured_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-http/tools.result.structured_only/record.json) | default | http | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [structured_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.structured_only/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [structured_only](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/legacy/both-stdio/tools.result.structured_only/record.json) | legacy | stdio | `2025-11-25` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [summary_and_data](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-http/tools.result.summary_and_data/record.json) | default | http | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [summary_and_data](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/default/both-stdio/tools.result.summary_and_data/record.json) | default | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [summary_and_data](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/legacy/both-stdio/tools.result.summary_and_data/record.json) | legacy | stdio | `2025-11-25` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) | | [summary_and_data](https://github.com/olaservo/canimcp/blob/main/probe/runs/mastra@mcp-2.9.0-alpha.1+core-1.83.0-alpha.1/return-errors/both-stdio/tools.result.summary_and_data/record.json) | return-errors | stdio | `2026-07-28` | mcp-2.9.0-alpha.1+core-1.83.0-alpha.1 | {…} structuredContent only (1x, as json) |