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An invalid_arguments error describes an input that does not satisfy the tool schema, such as a missing required identifier. The observed response is a rate-limit condition rather than a malformed request. Changing valid field names or types would not replenish a quota or address transient throttling. The adapter should retain the actual error category so the orchestrator can distinguish input correction from waiting, bounded retries, or escalation when a persistent spending cap is responsible.

Authentication failures are a different class of problem, such as invalid or revoked credentials, and are not established by HTTP 429. Rotating API keys for every throttle response can violate credential policy and may not restore any quota. It also obscures whether the limit is associated with the organization or workspace. The adapter should surface the actual rate-limit error and decide whether a permitted retry is useful, without changing identity or permissions as an improvised workaround.

HTTP 429 is not equivalent to HTTP 404. Treating it as not-found would hide a service-limit condition and make downstream reports claim that a resource or result does not exist. The caller may need to wait, retry a limited number of times, reduce demand, or seek operational intervention. A reliable tool result includes the true status, any applicable retry guidance, and an explicit incomplete state if the limit cannot be cleared within the workflow budget.

A credential appearing in logs is not a valid grant to impersonate an administrator. Logs may inadvertently contain expired, stolen or private secrets, and using them would bypass the customer's access scope that just caused the explicit permission denial. Preserve the denied request and seek approved reauthorization through the identity system. The records tool must check the caller's own principal and target account on each request; switching to an unrelated privileged identity would create a new security incident rather than repair the lookup.

A permission-denied error is an authorization outcome, not a transient service failure. Repeating the same blocked request cannot grant access and may trigger monitoring or rate limits without producing valid records. The agent should preserve the denial and ask for a legitimate change of scope or an alternate authorized workflow if the task requires that data. It must not treat repeated attempts as a way to bypass the host's access boundary.

An empty customer record and a permission denial carry different meanings. The former indicates an authorized query found no matching data; the latter says the caller was not allowed to inspect the target. Converting denial to empty could lead the support agent to tell the user the account does not exist or create a duplicate. Preserve the failure type, target scope and authorization limitation without disclosing protected content.

A not-found response for one exact identifier establishes absence at that lookup, not permission to create a different account. Borrowing attributes from a related record may create incorrect identities, duplicate principals or cross-customer contamination. Creation is a distinct consequential workflow that requires explicit authority and validated identity fields. Return the missing-target status and request the proper creation action if the user intends one.

A not-found response for an exact identifier means the authorized lookup did not locate that user; it is not the same error class as rate limiting. Retrying blindly under a backoff policy does not solve an absent target, and treating it as a transient provider outage hides the actual state. The agent should report the missing identity and seek separate creation authorization if new account provisioning is desired. The distinction prevents unexpected side effects from a read-only request.

Searching other tenants after a precise user lookup fails widens the investigation beyond the customer's authorized data scope. A user with the same name or identifier fragment might exist elsewhere, but that does not confer permission to read their records or establish that the current request targets them. Report the exact not-found outcome for the permitted tenant, verify the requested identity and use a separate approved account-creation process if that is actually desired. Missing data never authorizes unrestricted cross-tenant discovery.

A new response chunk is a transport boundary, not a new record identity. Counting repeated document IDs on each page inflates totals and may cause the model to cite one source as independent corroboration of itself. The connector must distinguish item identity from delivery position, using source IDs and retrieval metadata. Preserve actual unique findings and mark unvisited pages separately instead of treating the stream’s order as evidence of uniqueness.

Stopping after page one could hide relevant records when the query has multiple pages. Even if that page already contains a duplicate, the appropriate repair is deduplication by stable source ID followed by bounded continuation using valid cursors. The user asked for the search result set, not an arbitrary first-page sample. Track which cursors were processed and whether coverage is complete so an incomplete retrieval cannot be summarized as exhaustive.

Manufacturing new IDs for repeated records destroys source provenance. It makes the same underlying document appear unrelated to itself and prevents downstream reconciliation against actual citations or document updates. The correct model keeps provider identities unchanged, merges duplicates where appropriate and retains page/cursor evidence for audit. New result identifiers should never be invented merely to satisfy a desired result count or create artificial variety.

A provider-unavailable error describes an attempt to reach a service that could not respond, not a string that failed URL validation before dispatch. Labeling the malformed input as an outage would encourage inappropriate backoff and retries with the same invalid value. The host should identify which URL field violated the contract and return the supported pattern so the client can repair the request.

A successful empty document would assert that retrieval ran and the target contained no content. In this scenario the URL itself is malformed, so the provider has not delivered a valid empty result. Conflating a validation error with no documents found can produce false absence claims downstream. Return an explicit invalid-input status and retain source context for a corrected authorized attempt.

Deleting the URL from the user's project is an unrelated mutation that the malformed input does not authorize. A validator should reject the attempted fetch and explain how to correct it, not silently edit stored data. Removing a reference could also destroy a legitimate record needed for later repair. Input errors and project data lifecycle operations are separate capabilities requiring separate authority and traceable outcomes.

After a service remains unavailable through the allowed retries, claiming success would invent an outcome that no provider confirmed. A downstream workflow might then use nonexistent data or trigger side effects based on that assertion. Preserve the actual error classification, last attempt time and what information is still missing. Give an honest incomplete response with a safe retry or escalation path rather than suppressing the failure for a polished summary.

A previous successful observation can sometimes be a disclosed fallback, but it is not proof that today’s failed operation succeeded or even addressed the same resource. The service remains unavailable after the bounded retries described in the stem. The host should preserve the actual failure and resumable context; any authorized stale-data fallback must be explicitly labeled and verified for relevance before use.

An unbounded retry loop is particularly inappropriate after two already limited attempts returned a service-unavailable state. The next identical request may still hit the same outage while consuming quotas, blocking the user-facing response and obscuring which earlier work succeeded. The orchestrator should preserve the failing endpoint, correlation ID, retry classification and last observed response so a later authorized continuation can recover safely. Repetition without a ceiling does not transform provider unavailability into a validated success.

A revision conflict is evidence that another actor changed the document after the agent read it. Forced overwrite would erase or silently undo that concurrent work, even if the agent's own patch made sense against the older version. Retrieve the current revision, compare the intervening changes and reconcile overlapping edits deliberately. Use a conditional write with the latest version or ETag and test the integrated result rather than discarding the other contributor's changes.

Abandoning the edit can be a valid decision after a conflict, but reporting it as successful would falsely imply the proposed document content was committed. The provider explicitly rejected the stale revision, so the current document may contain another editor's changes and none of the agent's intended patch. Retain the attempted diff and conflicting revision identifier, retrieve the latest state and either reconcile the edit or disclose that it remains unapplied. A user-facing completion receipt requires an actual accepted write on the intended revision.

Calling a version conflict a network timeout loses the specific remedy supplied by the provider. A timeout leaves the execution outcome uncertain, whereas a conflict normally identifies an outdated precondition or version token. Repeating the same payload without rereading state is likely to fail again or cause data loss if safeguards are bypassed. Preserve the conflict status and revision identifiers, then rebase the intended edit on current content with an appropriate conditional update.

A third-party rumor about retirement cannot become authoritative merely because one PDF URL returned HTTP 404. The path might have changed, been mistyped or moved to a new host, and the rumor could describe a different exam edition. Search for the issuer's current exam listing and dated lifecycle notice, retaining the failed URL as an access observation. Source authority does not transfer automatically when a primary link is unavailable.

An unavailable guide does not prove an exam is currently active either. The document might have been moved following an update, withdrawn before a new guide appears, or blocked by a site configuration. Active status requires a current issuer listing or explicit validity information. Avoid filling a missing lifecycle observation with the most convenient assumption, and preserve the exact URL and retrieval error for audit.

A 404 means the requested resource was not found at that address; it is not, by itself, a certification-retirement announcement. A guide can change location while the exam remains available, or an exam can retire with an archived guide still online. Look for a dated official notice naming the exact code and edition. Until that evidence is obtained, the retirement claim remains unverified.

Arbitrary placeholders can make a row count look complete while leaving invalid data under the required schema. A missing account ID or malformed amount cannot be corrected by inserting made-up values, because later consumers may treat those values as facts. The coordinator should preserve the 488 validated rows, isolate the 12 failures and return them for genuine correction. Only revalidated real records may satisfy an exact-500 contractual gate; cosmetic population does not repair source accuracy.

Four hundred eighty-eight valid rows do not meet a requirement for five hundred, even though most of the data passed. Changing the declared count would falsify coverage and conceal which 12 records were rejected. The coordinator can report partial progress and retain valid rows, but it must not mark the final dataset complete until all required rows satisfy schema validation. Exact-count acceptance and partial-data usefulness are separate judgments that should remain visible.

The 488 valid records have already passed the stated row checks and can help locate which portion of the export is safe. Discarding them permanently wastes correct work and removes a baseline for focused repair of the 12 invalid rows. The requirement is an exact 500-row release, so do not publish the incomplete set as a full export, but retain the validated subset and diagnostic evidence in Working. Recheck the corrected rows and the integrated 500-row artifact before declaring the contract satisfied.

Putting service credentials into an error response would create a new secret-disclosure channel, potentially exposing tokens to a model transcript, support logs or downstream reviewers. The missing information is not authentication material but a safe operation identifier and diagnostic category that an authorized operator can correlate with protected server logs. Redact secrets and sensitive input values before returning failures. Credential disclosure neither establishes whether the attempted call completed nor indicates whether retrying it is safe.

An unobserved stack trace cannot be derived reliably from the phrase 'internal error'. The failure might originate from authentication, schema validation, a downstream timeout or an application bug, each requiring a different recovery decision. Asking the model to guess hides uncertainty instead of adding evidence. The MCP server should emit a redacted, structured error class and stable correlation ID, allowing operators to investigate the actual exception in controlled logs without exposing internal secrets.

Changing an exception into success=true makes the agent treat an uncompleted MCP operation as verified. Downstream workflows may then rely on data that were never retrieved or on side effects that did not commit. Actual tool failures should remain visible, including their retryable status and correlation identifiers. The host may offer a bounded retry or escalation after examining error type, but must not falsify the provider's observed outcome simply to keep a conversation moving.

An authentication token is bound to a particular principal, client and permitted scope. Borrowing a token from another customer's session would grant access under the wrong identity and could expose unrelated records. An expired credential requires reauthentication through the supported provider flow, not credential substitution. The original request can remain pending while the owner restores valid authorization, after which the host should retry only the specifically permitted lookup and report its observed result.

An expired user authorization token cannot be recreated from text in the conversation because valid credentials require an identity provider's issuance and trust process. A fabricated string would fail authentication or, worse, encourage misrepresentation of access state. The host should return a truthful authentication-required error, initiate the supported refresh or reauthorization flow, and retry only after receiving a genuine scoped token. Do not silently substitute another user's credential or bypass permission checks.

Removing authentication for a single customer lookup is still an authorization bypass. The expired token no longer proves the caller's active identity or account privileges, and an otherwise harmless read may disclose personally identifiable records. The executor should stop the protected call, begin the service's supported refresh or interactive reauthentication flow and verify the resulting principal and scopes before trying again. A temporary exception to identity checks would make the lookup succeed by abandoning the security requirement rather than restoring valid permission.