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fix(compression): bound mcpAccessibility maxTextChars on the live read path (#4206)

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* fix(compression): bound mcpAccessibility maxTextChars on the live read path

smartFilterText reserves 300 chars for the truncation tail, so a maxTextChars at/below that
makes headSize <= 0 and the whole tool result is replaced by the notice (total data loss). Two
gaps let a bad value reach the engine: the DB normalizer floored maxTextChars only at > 0, and
the live MCP-server read path (readMcpAccessibilityConfig) did a raw {...DEFAULT, ...parsed}
spread with no bounding at all.

Centralize the floors in a shared clampMcpAccessibilityConfig (engine layer) used by both the DB
normalizer and the server read path; values in (0, 600) fall back to the default. Export the
tail-reserve constant (300) and use it in smartFilterText so the engine and the bounds stay in
sync. The F5.3 headSize >= 0 clamp stays as a second layer.

Defense-in-depth today (the config isn't writable via the settings API yet — making it
configurable is a tracked follow-up in the compression-completeness work); this closes the
data-loss path for when it lands.

Part of the compression "100% functional" program (audit follow-up).

* chore(quality): bump server.ts file-size baseline 1457->1458 (#4206 +1 import)
This commit is contained in:
Diego Rodrigues de Sa e Souza
2026-06-18 19:14:13 -03:00
committed by GitHub
parent aed2a5024c
commit 4fecb34ac6
7 changed files with 111 additions and 37 deletions
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31
src/lib/db/compression.ts
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@@ -11,6 +11,7 @@ import {
DEFAULT_MCP_ACCESSIBILITY_CONFIG,
DEFAULT_RTK_CONFIG,
DEFAULT_ULTRA_CONFIG,
clampMcpAccessibilityConfig,
type AggressiveConfig,
type CavemanConfig,
type CavemanOutputModeConfig,
@@ -519,32 +520,10 @@ export function getDefaultRtkConfig(): RtkConfig {
}
function normalizeMcpAccessibilityConfig(value: unknown): McpAccessibilityConfig {
const record = toRecord(value);
return {
...DEFAULT_MCP_ACCESSIBILITY_CONFIG,
...record,
enabled: record.enabled !== false,
maxTextChars:
typeof record.maxTextChars === "number" && record.maxTextChars > 0
? Math.floor(record.maxTextChars)
: DEFAULT_MCP_ACCESSIBILITY_CONFIG.maxTextChars,
collapseThreshold:
typeof record.collapseThreshold === "number" && record.collapseThreshold > 0
? Math.floor(record.collapseThreshold)
: DEFAULT_MCP_ACCESSIBILITY_CONFIG.collapseThreshold,
collapseKeepHead:
typeof record.collapseKeepHead === "number" && record.collapseKeepHead >= 0
? Math.floor(record.collapseKeepHead)
: DEFAULT_MCP_ACCESSIBILITY_CONFIG.collapseKeepHead,
collapseKeepTail:
typeof record.collapseKeepTail === "number" && record.collapseKeepTail >= 0
? Math.floor(record.collapseKeepTail)
: DEFAULT_MCP_ACCESSIBILITY_CONFIG.collapseKeepTail,
minLengthToProcess:
typeof record.minLengthToProcess === "number" && record.minLengthToProcess > 0
? Math.floor(record.minLengthToProcess)
: DEFAULT_MCP_ACCESSIBILITY_CONFIG.minLengthToProcess,
};
// clampMcpAccessibilityConfig (engine layer) owns the numeric floors so the DB normalizer and
// the live MCP-server read path agree — in particular it floors maxTextChars to a sane minimum
// (a value below the tail reservation would make smartFilterText truncate the whole text away).
return clampMcpAccessibilityConfig(value);
}
export async function getMcpAccessibilityConfig(): Promise<McpAccessibilityConfig> {