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Martin Vogel
f27f0a2a6c
Every non-JSON tool result shipped its payload twice: content[0].text, and an
identical copy as structuredContent {"text": <entire payload>}. Measured on a
20k-node query_graph, the reply was 2.05x the payload it carried. Half of every
large answer was redundant bytes — half the 10 MiB transport budget, and double
the tokens billed to every LLM caller on every call.
Measured, same query, same fixture:
before 8,529,990 bytes content.text 4,154,932 structuredContent.text SAME
after 4,265,047 bytes content.text 4,154,932 structuredContent {}
Exactly 50.0% smaller with content.text byte-identical: the payload is fully
delivered, only the second copy is gone. The 10 MiB ceiling now also admits
roughly twice the rows before #1375's limit applies.
Nothing is lost. structuredContent exists to carry STRUCTURE, and a string
re-wrapped in a one-key object has none — a client reading
structuredContent.text learned exactly what content[0].text already told it. The
empty object still satisfies the declared outputSchema, which is
{"type":"object","additionalProperties":true} and never required a text field.
Two cases are deliberately NOT changed:
* JSON payloads. structuredContent stays the PARSED object. That is the
spec's structured+serialized pattern rather than waste, and it is what our
own hook-augment consumes (structuredContent.projects from list_projects).
* Errors. structuredContent.error is kept: bounded, small, and the only
machine-readable form of a failure a client gets.
Guarded at both levels, because the defect was invisible per-tool — each result
looked reasonable alone, and only measuring the wire showed half of it was
redundant:
* tests/test_mcp.c enumerates the TOOL TABLE itself, so a new tool is covered
the moment it is registered, with no test edit. A guard pinned to
query_graph would not have caught search_graph, and would not catch whatever
is added next. It fails if no tool produced a non-JSON payload, so it cannot
report a green it never earned — which it did on the first attempt, catching
that {} args make every tool error out and assert nothing.
* scripts/smoke-test.sh Phase 3z asserts the same property on the SHIPPED
binary. This is a wire-format contract: what a real client receives from the
real artifact is not something a from-source test can prove.
Both revert-checked: restoring the duplication reddens the unit guard at the
strcmp, the plain-text guard, the search_graph expectation, and the smoke phase
(which names search_graph and get_architecture).
tests/test_mcp.c expectations that pinned the old duplicating shape are updated
rather than relaxed — the format changed on purpose.
Signed-off-by: Martin Vogel <martin.vogel.tech@gmail.com>