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fix: sanitize JSON before parsing in settler-delta-parser #133

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fix: sanitize JSON before parsing in settler-delta-parser #133

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0a1a906
fix: wrap validateRuntimeState in try-catch to prevent JSON parse err…
Mar 31, 2026
9b8a12b
fix: sanitize JSON before parsing in settler-delta-parser
Mar 31, 2026
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8 changes: 7 additions & 1 deletion packages/core/src/agents/settler-delta-parser.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -8,6 +8,12 @@ export interface SettlerDeltaOutput {
readonly runtimeStateDelta: RuntimeStateDelta;
}

function sanitizeJSON(str: string): string {
return str
.replace(/[\x00-\x08\x0B\x0C\x0E-\x1F\x7F]/g, "")
.replace(/,\s*([}\]])/g, "$1");
}

export function parseSettlerDeltaOutput(content: string): SettlerDeltaOutput {
const extract = (tag: string): string => {
const regex = new RegExp(
Expand All @@ -25,7 +31,7 @@ export function parseSettlerDeltaOutput(content: string): SettlerDeltaOutput {
const jsonPayload = stripCodeFence(rawDelta);
let parsed: unknown;
try {
parsed = JSON.parse(jsonPayload);
parsed = JSON.parse(sanitizeJSON(jsonPayload));
} catch (error) {
throw new Error(`runtime state delta is not valid JSON: ${String(error)}`);
}
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128 changes: 69 additions & 59 deletions packages/core/src/state/state-validator.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -17,74 +17,84 @@ export function validateRuntimeState(input: {
readonly hooks: unknown;
readonly chapterSummaries: unknown;
}): RuntimeStateValidationIssue[] {
const issues: RuntimeStateValidationIssue[] = [];
try {
const issues: RuntimeStateValidationIssue[] = [];

const manifest = parseOrIssue(
StateManifestSchema,
input.manifest,
issues,
"invalid_manifest",
"manifest",
);
const currentState = parseOrIssue(
CurrentStateStateSchema,
input.currentState,
issues,
"invalid_current_state",
"currentState",
);
const hooks = parseOrIssue(
HooksStateSchema,
input.hooks,
issues,
"invalid_hooks_state",
"hooks",
);
const chapterSummaries = parseOrIssue(
ChapterSummariesStateSchema,
input.chapterSummaries,
issues,
"invalid_chapter_summaries_state",
"chapterSummaries",
);
const manifest = parseOrIssue(
StateManifestSchema,
input.manifest,
issues,
"invalid_manifest",
"manifest",
);
const currentState = parseOrIssue(
CurrentStateStateSchema,
input.currentState,
issues,
"invalid_current_state",
"currentState",
);
const hooks = parseOrIssue(
HooksStateSchema,
input.hooks,
issues,
"invalid_hooks_state",
"hooks",
);
const chapterSummaries = parseOrIssue(
ChapterSummariesStateSchema,
input.chapterSummaries,
issues,
"invalid_chapter_summaries_state",
"chapterSummaries",
);

if (hooks) {
const seen = new Set<string>();
for (const hook of hooks.hooks) {
if (seen.has(hook.hookId)) {
issues.push({
code: "duplicate_hook_id",
message: `duplicate hook id: ${hook.hookId}`,
path: `hooks.${hook.hookId}`,
});
if (hooks) {
const seen = new Set<string>();
for (const hook of hooks.hooks) {
if (seen.has(hook.hookId)) {
issues.push({
code: "duplicate_hook_id",
message: `duplicate hook id: ${hook.hookId}`,
path: `hooks.${hook.hookId}`,
});
}
seen.add(hook.hookId);
}
seen.add(hook.hookId);
}
}

if (chapterSummaries) {
const seen = new Set<number>();
for (const row of chapterSummaries.rows) {
if (seen.has(row.chapter)) {
issues.push({
code: "duplicate_summary_chapter",
message: `duplicate summary chapter: ${row.chapter}`,
path: `chapterSummaries.${row.chapter}`,
});
if (chapterSummaries) {
const seen = new Set<number>();
for (const row of chapterSummaries.rows) {
if (seen.has(row.chapter)) {
issues.push({
code: "duplicate_summary_chapter",
message: `duplicate summary chapter: ${row.chapter}`,
path: `chapterSummaries.${row.chapter}`,
});
}
seen.add(row.chapter);
}
seen.add(row.chapter);
}
}

if (manifest && currentState && currentState.chapter > manifest.lastAppliedChapter) {
issues.push({
code: "current_state_ahead_of_manifest",
message: `current state chapter ${currentState.chapter} exceeds manifest ${manifest.lastAppliedChapter}`,
path: "currentState.chapter",
});
}
if (manifest && currentState && currentState.chapter > manifest.lastAppliedChapter) {
issues.push({
code: "current_state_ahead_of_manifest",
message: `current state chapter ${currentState.chapter} exceeds manifest ${manifest.lastAppliedChapter}`,
path: "currentState.chapter",
});
}

return issues;
return issues;
} catch (error) {
return [
{
code: "validator_crash",
message: String(error),
path: "",
},
];
}
}

function parseOrIssue<T>(
Expand Down