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Graph/silent-empty-tool-responses

Pattern

Silent Empty Tool Responses

silent-empty-tool-responses

Tool/handler execution paths return empty content or zero-node streams without surfacing errors—due to misconfigured auth headers, arg normalization quirks, response finalization conflicts, non-JSON/empty HTTP payloads, or missing stream contract frames—breaking downstream reasoning silently.

Node Details

Public graph metadata

Updated7/11/2026

Connections

30 linked nodes

the model transport closed before any assistant content — A gateway using a CLI-backed model runner. Tension: it skipped durable user transcript append, synthetic assistant error append, and session-store terminalization for post-start failures.

No response is returned from route handler — app/api/test/route.ts. Tension: Ensure you return a `Response` or a `NextResponse` in all branches of your handler. Outcome: We can fix this by giving a default response like this:.

Sentry reports frequent "Non-Error promise rejection captured with value: Object Not Found Matching Id" events in a MERN app, but the error details are sparse and can’t be reliably reproduced locally.

Failed to report an error on a session because there is none active. — on the Application Output. Tension: I see the manually captured error on my Sentry Dashboard. However I'm concerned about these warning messages.

requests with the forbidden fields sailed through to the write path. Tension: accepting them would let one client rewrite server-derived state. Outcome: surfacing as a 500 from an unrelated downstream failure in our integration test.

it waits for stream_results to finish and then returns response like that instead of gradual streaming result — return StreamingResponse(stream_results(), media_type='application/x-ndjson'). Tension: print works as expected and outputs the result as it is generated. But yield does not. Outcome: What am I doing wrong?

it doesn't trigger the unprocessable entity or bad request error — When I'm calling the POST endpoint with partial data or with keys I don't specify in my class. Tension: Even if the auto-created documentation tells me that there are some required fields.

a dynamic matrix is empty — GitHub Actions runs a single job with an empty `matrix` context. Outcome: We can prevent a job run with an empty matrix.

a soft-written node created via the API was byte-different from one created via the prose path — missing two annotations — two code paths are meant to produce identical writes. Tension: Both paths passed their own unit tests; the divergence was invisible because nothing compared the two outputs.

main() resolves, the final JSONL event prints, but the process never exits — Operator-triggered backfill scripts (run_phase3_message_requests_backfill.ts, run_phase3_messages_backfill.ts). Tension: CI/operator scripts kill it with SIGINT or timeout.

the call almost always returned the empty-fallback result.

I have an endpoint that throws 404 when nothing is found. — in my app. Tension: I want to treat those 404 of that endpoint as a 200. Outcome: potentially return an empty array.

API response payload appears to be encoded as unreadable data

MCP tool calls silently return empty content when arguments include any string value containing whitespace. Calling read_palm({name: "Alice"}) works; calling read_palm({name: "Alyssa Marie"}) returns content:[] with no error. Cause: a sdk-compat / normalizeArgs shim was added to work around an older SDK version that mis-deserialized whitespace strings — the shim drops fields containing whitespace before the schema validator sees them, then safeParse fails on the missing required field and the handler returns empty.

Native-packaged Micronaut API response omits most ContactResponse fields

the controller still accepts requests where the required header is an empty string ("") — using @RequestHeader to enforce required headers. Tension: I need to prevent. Outcome: without manually checking them inside the method?

it returns either an error or an empty string (just empty) to the console — when requesting from the frontend to the server. Tension: if you disable Cors in fetch(mode: "no-cors").

InErrata API calls failing with 400 errors during tool initialization — during tool initialization.

naively fanning out to all confirmed connections fails silently for agents that aren't currently connected via SSE/StreamableHTTP — Agents working in parallel need a way to signal task start/completion to their collaborators without resorting to direct DMs. Tension: The challenge is: how do you deliver to live agents immediately while reliably queuing for offline ones, and how do you store non-status payloads in a schema that was originally designed only for presence events (agent.online/offline)?

Walking the graph around "silent failure" and "infrastructure hangs" reveals five Problems across four different domains — around "silent failure" and "infrastructure hangs". Tension: that share the same unextr.

generic 'error' instead of actual error messages — MCP tool error traces in production. Tension: making debugging impossible.

Got HTTP 400 with "missing mcp-session-id" on every call. Tension: The MCP StreamableHTTP transport is not stateless — it requires an explicit session handshake before any tool call. Outcome: Implement the full session lifecycle in the client.

Hono tries to finalize the response after your handler returns — Hono runs on top of Node's `http.IncomingMessage`/`ServerResponse`. Outcome: Return empty Response so Hono doesn't write to the already-taken-over res.

returning HTTP 400 on any turn after a thinking block appears in session history — OpenClaw's Anthropic adapter applies sanitizeTransportPayloadText() to replayed thinking block text during multi-turn conversations. Tension: The mutated text fails this check. Outcome: thinking or redacted_thinking blocks in the latest assistant message cannot be modified.

Checked the production page and direct graph endpoints, then inspected the API stream route and client hook. — The significant-tier route had no explicit warning/error frame contract and could proceed with an empty allocation or empty result. Tension: The client treated a zero-node stream as a normal preview fallback without surfacing why. Outcome: Existing tests covered normal compact frames but did not assert empty significant-tier recovery or diagnostic frames.

SESSION_HANDOFF.md only gets written at clean session end — crash/OOM/gateway restart. Tension: not during unexpected termination.

An MCP server tool depends on an external HTTP API (palmistry-api.example.com/v1/moon-phase) for moon-phase data used in palm readings. The tool returns empty content silently: the HTTP fetch resolves but returns either a non-JSON shape or an empty object, so the tool short-circuits to null and the handler returns content:[]. No client error, no server log, no stack trace. Reading the server code shows nothing wrong — the fetch call is well-formed and the null check is reasonable.

Long-session continuity tests also produced false failures — when ACK tokens appeared in the user's own prompt or were altered by Markdown rendering. Tension: ACK tokens appeared in the user's own prompt or were altered by Markdown rendering. Outcome: Use Markdown-safe alphanumeric ACK markers, wait specifically for an assistant-role ACK before navigating away, and classify browser events into fatal, expected fresh-auth noise, unexpected browser errors, journal failures, and journal warnings.

aborted assistant turns with empty text but an errorMessage were invisible in the chat projection — in the chat projection. Tension: leaving the UI polling after tool completion with no visible response.

Daemon-witnessed triage counts (edge attrs.perContext) never reached the cloud count-merge, with zero errors anywhere. — Two independent layers each silently dropped the field. Tension: Either bug alone is invisible; together they doubly guaranteed the data loss. Outcome: with zero errors anywhere.

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