Improve MCP validation efficiency and annotate public APIs with nodiscard by HarshPopat23 · Pull Request #3024 · sourcemeta/core

HarshPopat23 · 2026-10-16T06:34:02Z

Summary

Combines MCP validation performance and API safety improvements:

Validation Efficiency & Reduced Allocations:
- Replaced the ad-hoc strings() array-checking loop in src/core/mcp/validation.h with native member function is_array_of_strings() across �udience, sizes, stopSequences, and task environment object values.
- Eliminated redundant string copies on dispatch (const auto &name{...to_string()}) in sampling_block(), sampling_message_block(), �alid_content(), and �alid_input_requests().
- Reused bound string references across �nnotations() and icons() loops.
- Retained exact JSON number comparisons for annotation priority bounds (*priority < JSON{0} || *priority > JSON{1}) to preserve Decimal precision without rounding or overflow.
Annotate Public MCP Functions with [[nodiscard]]:
- Added [[nodiscard]] to all public query, validation, parsing, and factory functions across mcp_protocol.h, mcp_headers.h, mcp_results.h, mcp_capabilities.h, mcp_error.h, and mcp_logging.h to prevent callers from silently ignoring validation results or responses (excluding void-returning mcp_write_result).
- Updated est/mcp/mcp_helpers.h (EXPECT_MCP_REJECTS) and est/mcp/mcp_error_test.cc to cast discarded expressions to �oid for -Werror=unused-result compliance.

Testing

Full MSYS2 UCRT64 GCC 14.2 & Ninja build cleanly passing.
100% pass on all test suites:
- core.mcp: all 1,409 tests passed, 0 failed.
- core.json: passed.
- core.jsonrpc: passed.
Code formatted with repository's clang-format configuration.

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All reported issues were addressed across 2 files

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augmentcode · 2026-10-16T06:39:19Z

🤖 Augment PR Summary

Summary: Improves MCP validation efficiency and makes ignored public API results visible.

Replaces the local string-array validator with JSON::is_array_of_strings().
Applies it to audiences, icon sizes, sampling stop sequences, and elicitation content arrays.
Borrows strings during sampling, content, and nested-request dispatch instead of copying them.
Reuses string references when checking audience roles and icon themes.
Checks nonnegative resource sizes using is_integral() and is_positive().
Preserves exact JSON-number comparisons for annotation priority bounds.
Adds [[nodiscard]] across protocol, header, result, capability, error, and logging APIs.
Leaves the void-returning mcp_write_result() unannotated.
Explicitly discards factory results in exception tests while preserving their evaluation.

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HarshPopat23 · 2026-10-16T07:22:44Z

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All reported issues were addressed across 9 files (changes from recent commits).

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HarshPopat23 · 2026-10-16T08:42:57Z

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HarshPopat23 · 2026-10-16T09:01:51Z

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…card - Replace ad-hoc array of strings validation loop with is_array_of_strings() in validation.h. - Avoid unnecessary string allocations when dispatching message and content types. - Annotate public MCP functions across protocol, headers, results, capabilities, error, and logging with [[nodiscard]]. - Update test helpers to cast discarded results to void. Signed-off-by: HarshPopat23 <musichk61@gmail.com>

HarshPopat23 · 2026-10-16T09:04:48Z

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HarshPopat23 force-pushed the perf/mcp-reduce-temporary-allocations branch from aa5d198 to ef8c35d Compare October 16, 2026 07:05

HarshPopat23 changed the title ~~Avoid temporary allocations in MCP validation and parameter parsing~~ Avoid temporary allocations in MCP validation Oct 16, 2026

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HarshPopat23 force-pushed the perf/mcp-reduce-temporary-allocations branch from ef8c35d to c704323 Compare October 16, 2026 08:04

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Comment thread src/core/mcp/include/sourcemeta/core/mcp_logging.h Outdated

HarshPopat23 changed the title ~~Avoid temporary allocations in MCP validation~~ Improve MCP validation efficiency and annotate public APIs with nodiscard Oct 16, 2026

HarshPopat23 force-pushed the perf/mcp-reduce-temporary-allocations branch from aea02e4 to 205435d Compare October 16, 2026 08:32

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Comment thread src/core/mcp/include/sourcemeta/core/mcp_error.h

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HarshPopat23 force-pushed the perf/mcp-reduce-temporary-allocations branch from 205435d to d10e9ce Compare October 16, 2026 09:01

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HarshPopat23 closed this Oct 16, 2026

HarshPopat23 force-pushed the perf/mcp-reduce-temporary-allocations branch from d10e9ce to 8f7d7f2 Compare October 16, 2026 09:04

HarshPopat23 reopened this Oct 16, 2026

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