FIPA Agree Communicative Act Specification


Document title

FIPA Agree Communicative Act Specification

Document number


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Document status


Date of this status





Change history


Deprecated by FIPA00037


Line numbering added











2000 Foundation for Intelligent Physical Agents -

Geneva, Switzerland


Use of the technologies described in this specification may infringe patents, copyrights or other intellectual property rights of FIPA Members and non-members. Nothing in this specification should be construed as granting permission to use any of the technologies described. Anyone planning to make use of technology covered by the intellectual property rights of others should first obtain permission from the holder(s) of the rights. FIPA strongly encourages anyone implementing any part of this specification to determine first whether part(s) sought to be implemented are covered by the intellectual property of others, and, if so, to obtain appropriate licenses or other permission from the holder(s) of such intellectual property prior to implementation. This specification is subject to change without notice. Neither FIPA nor any of its Members accept any responsibility whatsoever for damages or liability, direct or consequential, which may result from the use of this specification.


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1 Scope. 1

2 Agree. 2

3 References. 3

1         Scope

This document specifies the Agree communicative act that is compliant to [FIPA00037] requirements.



2         Agree


The action of agreeing to perform some action, possibly in the future.


A tuple, consisting of an action expression denoting the action to be done, and a proposition giving the conditions of the agreement.


Agree is a general-purpose agreement to a previously submitted request act (see [FIPA00056]) to perform some action. The agent sending the agreement informs the receiver that it does intend to perform the action, but not until the given precondition is true.


The proposition given as part of the agree act indicates the qualifiers, if any, that the agent is attaching to the agreement. This might be used, for example, to inform the receiver when the agent will execute the action that it is agreeing to perform.


Pragmatic note: the precondition on the action being agreed to can include the perlocutionary effect of some other CA, such as an inform act (see [FIPA00046]). When the recipient of the agreement (e.g. a contract manager) wants the agreed action to be performed, it should then bring about the precondition by performing the necessary CA. This mechanism can be used to ensure that the contractor defers performing the action until the manager is ready for the action to be done.

Formal Model

<i, agree(j, <i, act>, f))>
<i, inform(j, Ii Done(<i, act>,
FP: Bi
aBi (Bifj a Uifj a)
RE: Bj



a = Ii Done(<i, act>, f)


Note that the formal difference between the semantics of agree and accept-proposal (see [FIPA00039]) rests on which agent is performing the action.


Agent i (a job-shop scheduler) requests j (a robot) to deliver a box to a certain location. J answers that it agrees to the request but it has low priority.


:sender i
:receiver j

(action j (deliver box017 (location 12 19)))
:protocol FIPA-Request
:reply-with order567)

:sender j
:receiver i

((action j (deliver box017 (location 12 19))

(priority order567 low)))
:in-reply-to order567
:protocol FIPA-Request)

3         References

[FIPA00037] FIPA Communicative Act Library Specification. Foundation for Intelligent Physical Agents, 2000.

[FIPA00039] FIPA Accept Proposal Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000.

[FIPA00046] FIPA Inform Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000.

[FIPA00056] FIPA Reject Communicative Act Specification. Foundation for Intelligent Physical Agents, 2000.