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SEP-2200: Clarify tool result content visibility #2200

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SEP-2200: Clarify tool result content visibility #2200

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62d39c9
Rebase SEP-2200 onto current main
krubenok Mar 13, 2026
c14325a
docs: refine SEP 2200 audience annotation rationale
krubenok Mar 27, 2026
3031d54
Restore SEP-2200 draft spec changes
krubenok Apr 14, 2026
bcc58f7
Merge remote-tracking branch 'origin' into u/kyrubeno/sep-structuredc…
krubenok May 1, 2026
190c6dc
PR Comments, thanks Den!
krubenok May 2, 2026
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6 changes: 6 additions & 0 deletions docs/docs.json
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Expand Up @@ -428,6 +428,12 @@
"seps/2207-oidc-refresh-token-guidance",
"seps/2260-Require-Server-requests-to-be-associated-with-Client-requests"
]
},
{
"group": "Draft",
"pages": [
"seps/2200-clarify-tool-result-content-visibility"
]
}
]
},
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194 changes: 194 additions & 0 deletions docs/seps/2200-clarify-tool-result-content-visibility.mdx
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2 changes: 2 additions & 0 deletions docs/seps/index.mdx
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1 change: 1 addition & 0 deletions docs/specification/draft/changelog.mdx
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Expand Up @@ -17,6 +17,7 @@ N/A
2. Document OpenTelemetry trace context propagation conventions for `_meta` keys (`traceparent`, `tracestate`, `baggage`) ([SEP-414](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/414)).
3. Servers **SHOULD** return tools from `tools/list` in a deterministic order to enable client-side caching and improve LLM prompt cache hit rates.
4. Require standard MCP request headers (`Mcp-Method`, `Mcp-Name`) on Streamable HTTP POST requests, and add support for custom headers from tool parameters via `x-mcp-header` ([SEP-2243](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2243)).
5. Clarify the intended audiences for `content` and `structuredContent` in tool results, including model visibility, fallback behavior, and `outputSchema` validation for non-error results ([SEP-2200](https://github.com/modelcontextprotocol/modelcontextprotocol/pull/2200)).

## Other schema changes

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