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fix(coding-agent): coerce stringified JSON edits in edit tool (#3370)
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Some models (Opus 4.6, GLM-5.1) send the edits parameter as a JSON
string instead of a parsed array. This fails AJV validation with
'must be array' and models fall back to sed/python.

Parse stringified edits in prepareEditArguments before validation.
This commit is contained in:
Danila Poyarkov 2026-04-18 19:29:23 +03:00 • committed by GitHub
parent 182d4ceea3
commit a2ec01e12f
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2 changed files with 42 additions and 6 deletions
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22
packages/coding-agent/src/core/tools/edit.ts
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@ -92,14 +92,24 @@ function prepareEditArguments(input: unknown): EditToolInput {
return input as EditToolInput;
}
const args = input as LegacyEditToolInput;
if (typeof args.oldText !== "string" || typeof args.newText !== "string") {
return input as EditToolInput;
const args = input as Record<string, unknown>;
// Some models (Opus 4.6, GLM-5.1) send edits as a JSON string instead of an array
if (typeof args.edits === "string") {
try {
const parsed = JSON.parse(args.edits);
if (Array.isArray(parsed)) args.edits = parsed;
} catch {}
}
const edits = Array.isArray(args.edits) ? [...args.edits] : [];
edits.push({ oldText: args.oldText, newText: args.newText });
const { oldText: _oldText, newText: _newText, ...rest } = args;
const legacy = args as LegacyEditToolInput;
if (typeof legacy.oldText !== "string" || typeof legacy.newText !== "string") {
return args as EditToolInput;
}
const edits = Array.isArray(legacy.edits) ? [...legacy.edits] : [];
edits.push({ oldText: legacy.oldText, newText: legacy.newText });
const { oldText: _oldText, newText: _newText, ...rest } = legacy;
return { ...rest, edits } as EditToolInput;
}

26
packages/coding-agent/test/edit-tool-legacy-input.test.ts
View file

@ -88,3 +88,29 @@ describe("edit tool prepareArguments", () => {
expect(await readFile(filePath, "utf8")).toBe("after\n");
});
});
describe("edit tool stringified edits", () => {
it("parses edits from a JSON string", () => {
const definition = createEditToolDefinition(process.cwd());
const prepared = definition.prepareArguments!({
path: "file.txt",
edits: JSON.stringify([{ oldText: "a", newText: "b" }]),
});
expect(prepared).toEqual({
path: "file.txt",
edits: [{ oldText: "a", newText: "b" }],
});
});
it("leaves edits alone when the string is not valid JSON", () => {
const definition = createEditToolDefinition(process.cwd());
const prepared = definition.prepareArguments!({
path: "file.txt",
edits: "not json",
});
expect(prepared).toEqual({
path: "file.txt",
edits: "not json",
});
});
});