Files

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169e7eaf4e feat(mcp): worked examples on five high-traffic tools, and in the error that rejects a call (#2100 )

#2066 asked for input_examples on the top ~20 tools by call volume. The
binding constraint turned out to be budget, not writing: after #2089
reclaimed 3 763 tokens, its own policy required ratcheting the tools/list
ceiling down with it, so the real headroom was 317 tokens. Ten examples
across five tools cost 199, leaving ~118. The ceiling is not raised.

Tools picked from 30 days of mcp.tool_called crossed with the
combinations the descriptions already warn about and callers still get
wrong: account_override without an explicit vat_treatment (books gross,
no moms line), representation without deltagare and syfte, confirmed on
a high-risk approval, a balanced voucher where the moms leg is its own
line, and get_kpi_report, where one caller sent `metric` 604 times over
seven days to a tool whose only parameter is period_id.

Examples are also surfaced in the unknown-parameter error. That costs
nothing in tools/list, because it only ships on the response to a call
that already failed, and it reaches the caller that most needs it: a key
list told DueCue's agent which parameter was wrong but not what a
correct call looks like, and the same rejected call repeated for a week.

Every example is validated against its own schema by the same
findUnknownArgKeys guard the server runs, plus required/type/enum/pattern
checks. An example our own boundary would reject is worse than none: it
teaches the exact mistake the guard then punishes. That test caught three
invented enum values in this change's own first draft.


Claude-Session: https://claude.ai/code/session_01L3P2hr19PhQuCoTSGoegcY

Co-authored-by: Jakob Wennberg <311770904+jakobwennberg-oss@users.noreply.github.com>
Co-authored-by: Claude Opus 5 <noreply@anthropic.com>

2026-09-01 20:18:19 +02:00

__tests__

feat(mcp): worked examples on five high-traffic tools, and in the error that rejects a call (#2100 )

2026-09-01 20:18:19 +02:00

prompts

feat(bank): expose bank-reported balance (booked + available) in UI, reconciliation, MCP and v1 API (#2118 )

2026-09-01 16:16:29 +02:00

resources

feat(reconciliation): match one bank event to several verifikationer (1:N) (#1553 ) (#2029 )

2026-08-30 11:56:15 +02:00

skills

feat(transactions): steer private marking in locked periods to ignore, with v1 and MCP ignore verbs (#1661 ) (#2031 )

2026-08-31 08:39:04 +01:00

widgets

fix(bank): 90-day lookback is the default: long PSD2 requests make some banks kill the session (#1964 )

2026-08-26 22:36:06 +02:00

arg-guard.ts

feat(mcp): worked examples on five high-traffic tools, and in the error that rejects a call (#2100 )

2026-09-01 20:18:19 +02:00

company-routing.ts

feat(billing): multi-user paywall: multi_user capability, 20-day grace, owner-only dormancy (#2099 )

2026-09-01 11:29:12 +02:00

dimensions.ts

style: remove em/en dashes repo-wide, add CLAUDE.md rule against them (#890 )

2026-07-04 15:58:06 +02:00

index.ts

fix(mcp): honest tool text and build-derived server version (#1923 )

2026-08-26 13:35:15 +02:00

manifest.json

Bug/invalid imports (#1146 )

2026-07-24 15:03:50 +02:00

origin-guard.ts

style: remove em/en dashes repo-wide, add CLAUDE.md rule against them (#890 )

2026-07-04 15:58:06 +02:00

public-tools.ts

feat(mcp): lazy authentication so a client can connect before an account exists (#1814 PR 2) (#1892 )

2026-08-25 11:38:29 +02:00

README.md

fix(mcp): promote gnubok_update_customer to the default tools/list catalog (#1986 )

2026-08-27 22:28:14 +02:00

recommended-tools.ts

feat(transactions): steer private marking in locked periods to ignore, with v1 and MCP ignore verbs (#1661 ) (#2031 )

2026-08-31 08:39:04 +01:00

server.ts

feat(mcp): worked examples on five high-traffic tools, and in the error that rejects a call (#2100 )

2026-09-01 20:18:19 +02:00

staging-pii-guard.ts

fix(customers): personnummer via MCP lands in personal_number, masked everywhere; MCP payment terms follow settings (#1788 )

2026-08-21 18:32:17 +02:00

supplier-candidates.ts

fix(inbox): match suppliers on VAT number, not just org-nr and name (#1630 )

2026-08-17 14:52:50 +02:00

tasks.ts

feat(mcp): Tasks extension (io.modelcontextprotocol/tasks) (#1283 )

2026-07-29 18:15:06 +02:00

tool-namespace.ts

Bug/invalid imports (#1146 )

2026-07-24 15:03:50 +02:00

tool-result.ts

style: remove em/en dashes repo-wide, add CLAUDE.md rule against them (#890 )

2026-07-04 15:58:06 +02:00

README.md

Accounted MCP server

JSON-RPC 2.0 server exposing the Accounted bookkeeping engine to MCP clients (Claude Desktop, Claude Code, etc.). Endpoint: /api/extensions/ext/mcp-server/mcp. Add ?tool_namespace=accounted for the Accounted tool names. Requests without it retain the legacy Gnubok namespace. OAuth and stdio bridges live alongside the API surface: see app/api/mcp-oauth/, packages/accounted-mcp/, and the compatibility package in packages/gnubok-mcp/.

Tool authoring contract

Enforced by tests in __tests__/: these are not style preferences, they're guard rails.

additionalProperties: false on every inputSchema. Guarded by strict-schemas.test.ts. Forces clear rejections on hallucinated fields instead of silent ignores.
Descriptions ≤ 280 chars. Guarded by output-schema.test.ts. No Args: / Returns: / Examples: prose: those belong in JSON Schema. Use agent-native hints ("Use to…", "Call X first", "HIGH risk").
Staged-operation envelope for write tools: outputSchema: STAGED_OPERATION_SCHEMA (server.ts). Fields: staged, risk_level, actor, message, preview, period_status?, next?. The staged: true boolean is the explicit completion signal; agents must not infer completion from prose. Do NOT introduce a parallel { success, shouldContinue, output } envelope.
period_status threading: any tool that ties to a fiscal-period-bound date (categorize, mark paid, create voucher, correct/reverse entry, approve supplier invoice) passes dateForPeriodCheck to stagePendingOperation. Response then includes period_status: { period_id, status: open|locked|closed, lock_date } so widgets and agents disable writes without round-trips.
Scope mapping: every new tool needs an entry in lib/auth/api-keys.ts TOOL_SCOPE_MAP. Missing entries default to deny.
Tests for new write tools: add staging-gate coverage to __tests__/voucher-tools.test.ts (or a sibling) plus executor coverage to lib/pending-operations/__tests__/voucher-executors.test.ts if the tool stages a new operation_type.

Determinism / cache stability

Tool definitions (name, description, inputSchema, outputSchema, annotations) are declared as static object literals at module load: no timestamps, no UUIDs, no Date/Math.random in the definition layer. This makes the tools/list JSON payload byte-stable across requests, which lets agent-side prompt caches stay warm. Do not introduce per-request non-determinism into the definitions block. Anything time-bound or random belongs inside execute().

For internal Anthropic API usage (the SDK is called from lib/ai/provider.ts and lib/ai/services/anthropic-family.ts; features such as extensions/general/invoice-inbox/lib/extract-invoice-fields.ts go through getAiService() in lib/ai rather than the SDK directly): annotate stable prefixes with cache_control: { type: 'ephemeral' } and log usage.cache_read_input_tokens for hit-ratio observability. The 1h TTL from the agent-native API plan (item 10) requires the direct Anthropic API; Accounted's Bedrock path defaults to a shorter TTL.

Payload-size watchdog

payload-size.bench.test.ts enforces a tools/list JSON payload ceiling. If the test fires, the right answer is rarely "raise the ceiling". Instead, trim descriptions or set specialized wide tools to catalogVisibility: 'search'. Those tools remain discoverable with full schemas through gnubok_search_tools and callable through tools/call on the wire without bloating the default catalog. Claude.ai only calls tools present in tools/list, so a tool that a user or a skill must call directly stays in the default catalog.

Where things live

server.ts: the tools array + JSON-RPC dispatcher
tool-result.ts: withNext(), toToolError() response helpers
resources/: read-only Accounted:// URIs, registered in resources/index.ts: company/current, period/active, recent-activity, capabilities, attention, chart-of-accounts, settings/vat-treatments, booking-templates, ledger/context, reconciliation/summary
widgets/: inline HTML widgets (receipt-matcher, vat-review, pending-operations)
prompts/: slash-command-style prompts
skills/: domain-knowledge skill bodies served via gnubok_load_skill
public-tools.ts: lazy authentication (issue #1814). ANONYMOUS_METHODS (initialize, ping, tools/prompts/resources listing) and the three PUBLIC_TOOLS (gnubok_search_tools, gnubok_list_skills, gnubok_load_skill) answer without credentials, rate-limited per truncated IP; every other tools/call gets a transport-level 401 + WWW-Authenticate from handleMcpRequest in server.ts, which is the challenge clients turn into their Connect prompt
tasks.ts: MCP Tasks extension (io.modelcontextprotocol/tasks): durable handles for long-running tool calls, rows in mcp_tasks (service-role writes only)
origin-guard.ts: Origin-header validation on the Streamable HTTP endpoint (DNS-rebinding defence required by the MCP spec)
staging-pii-guard.ts: refuses a plaintext personnummer in staged pending_operations params/preview, so every staging tool inherits the encrypt-at-staging rule
tool-namespace.ts: ?tool_namespace=accounted handling (accounted_* aliases for the canonical gnubok_* ids)
__tests__/: strictness guards + per-tool coverage