diff --git a/packages/codemode/CHANGELOG.md b/packages/codemode/CHANGELOG.md
index 231d972fc..983c2a6c0 100644
--- a/packages/codemode/CHANGELOG.md
+++ b/packages/codemode/CHANGELOG.md
@@ -8,7 +8,7 @@
 
 ### Fixed
 
-- Fixed `schemaToType()` and `renderDeclarations()` throwing `URIError` for a local `$ref` with a malformed percent escape; the reference now renders as `unknown` ([#11803](https://github.com/earendil-works/pi/issues/11803))
+- Fixed `schemaToType()`, `renderDeclarations()`, `renderToolSignature()`, and `renderToolSample()` throwing `URIError` for a local `$ref` with a malformed percent escape (`#/$defs/%E0`), so one such tool schema failed every caller that renders all tools. The reference now renders as `unknown`, like a reference that names nothing ([#11803](https://github.com/earendil-works/pi/issues/11803))
 
 ## [1.5.0] - 2026-11-02
 
diff --git a/packages/coding-agent/CHANGELOG.md b/packages/coding-agent/CHANGELOG.md
index 7c50b07fd..00fbc6169 100644
--- a/packages/coding-agent/CHANGELOG.md
+++ b/packages/coding-agent/CHANGELOG.md
@@ -40,6 +40,7 @@
 - Fixed `/mcp` sign-in staying on "Connecting…" for minutes after a successful browser sign-in, with Ctrl+C doing nothing: pi waited for the browser to drop an unused connection to the OAuth callback port. The callback server now closes remaining connections when it shuts down ([#11311](https://github.com/earendil-works/pi/issues/11311))
 - Fixed `tool_search` and `searchTools()` not finding a tool by property names and descriptions behind a local `$ref`, as in MCP input schemas that put their models in `$defs`. Referenced definitions are read once, so recursive schemas do not loop, and definitions nothing references stay out of the search text ([#11803](https://github.com/earendil-works/pi/issues/11803))
 - Fixed the codemode `resolves to` summary of a tool leaving out field names behind a local `$ref`, for example `structuredContent?` instead of `structuredContent?: { results }` for MCP output schemas that put their models in `$defs` ([#11803](https://github.com/earendil-works/pi/issues/11803))
+- Fixed every codemode script failing with `URI malformed` when any callable tool, such as an MCP tool, had a `$ref` with a malformed percent escape (`#/$defs/%E0`) in its schema, even scripts that do not call that tool. The parameter now renders as `unknown` in the tool's declaration ([#11803](https://github.com/earendil-works/pi/issues/11803))
 
 ## [1.5.0] - 2026-11-02
 
diff --git a/packages/durable/CHANGELOG.md b/packages/durable/CHANGELOG.md
index f388b8079..455bdae13 100644
--- a/packages/durable/CHANGELOG.md
+++ b/packages/durable/CHANGELOG.md
@@ -13,6 +13,7 @@
 ### Fixed
 
 - Fixed `tool_search` not finding a deferred tool by property names and descriptions behind a local `$ref` in its parameters, as in MCP input schemas that put their models in `$defs`. Referenced definitions are read once, so recursive schemas do not loop, and definitions nothing references stay out of the search text ([#11803](https://github.com/earendil-works/pi/issues/11803))
+- Fixed every code mode run failing with `URI malformed` when any callable tool had a `$ref` with a malformed percent escape (`#/$defs/%E0`) in its schema, even scripts that do not call that tool. The parameter now renders as `unknown` in the tool's declaration ([#11803](https://github.com/earendil-works/pi/issues/11803))
 
 ## [1.5.0] - 2026-11-02